Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018)
This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus t...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
S.C. Nwigbo [verfasserIn] S.O. Mbam [verfasserIn] C.U. Atuanya [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2014 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
In: Tribology in Industry - University of Kragujevac, 2012, 36(2014), 3, Seite 326-338 |
|---|---|
| Übergeordnetes Werk: |
volume:36 ; year:2014 ; number:3 ; pages:326-338 |
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| 520 | |a This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. | ||
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(DE-627)DOAJ017767911 (DE-599)DOAJ1030d1f8397a45608716c4fa5a4c2bb4 DE-627 ger DE-627 rakwb eng TJ1-1570 S.C. Nwigbo verfasserin aut Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018) 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. Brazing alloys Experimental design Mechanical properties mild steel Temperature Torch brazing Zinc Mechanical engineering and machinery S.O. Mbam verfasserin aut C.U. Atuanya verfasserin aut In Tribology in Industry University of Kragujevac, 2012 36(2014), 3, Seite 326-338 (DE-627)687132940 (DE-600)2652232-9 22177965 nnns volume:36 year:2014 number:3 pages:326-338 https://doaj.org/article/1030d1f8397a45608716c4fa5a4c2bb4 kostenfrei http://www.tribology.fink.rs/journals/2014/2014-3/12.pdf kostenfrei https://doaj.org/toc/0354-8996 Journal toc kostenfrei https://doaj.org/toc/2217-7965 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 36 2014 3 326-338 |
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(DE-627)DOAJ017767911 (DE-599)DOAJ1030d1f8397a45608716c4fa5a4c2bb4 DE-627 ger DE-627 rakwb eng TJ1-1570 S.C. Nwigbo verfasserin aut Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018) 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. Brazing alloys Experimental design Mechanical properties mild steel Temperature Torch brazing Zinc Mechanical engineering and machinery S.O. Mbam verfasserin aut C.U. Atuanya verfasserin aut In Tribology in Industry University of Kragujevac, 2012 36(2014), 3, Seite 326-338 (DE-627)687132940 (DE-600)2652232-9 22177965 nnns volume:36 year:2014 number:3 pages:326-338 https://doaj.org/article/1030d1f8397a45608716c4fa5a4c2bb4 kostenfrei http://www.tribology.fink.rs/journals/2014/2014-3/12.pdf kostenfrei https://doaj.org/toc/0354-8996 Journal toc kostenfrei https://doaj.org/toc/2217-7965 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 36 2014 3 326-338 |
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(DE-627)DOAJ017767911 (DE-599)DOAJ1030d1f8397a45608716c4fa5a4c2bb4 DE-627 ger DE-627 rakwb eng TJ1-1570 S.C. Nwigbo verfasserin aut Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018) 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. Brazing alloys Experimental design Mechanical properties mild steel Temperature Torch brazing Zinc Mechanical engineering and machinery S.O. Mbam verfasserin aut C.U. Atuanya verfasserin aut In Tribology in Industry University of Kragujevac, 2012 36(2014), 3, Seite 326-338 (DE-627)687132940 (DE-600)2652232-9 22177965 nnns volume:36 year:2014 number:3 pages:326-338 https://doaj.org/article/1030d1f8397a45608716c4fa5a4c2bb4 kostenfrei http://www.tribology.fink.rs/journals/2014/2014-3/12.pdf kostenfrei https://doaj.org/toc/0354-8996 Journal toc kostenfrei https://doaj.org/toc/2217-7965 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 36 2014 3 326-338 |
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(DE-627)DOAJ017767911 (DE-599)DOAJ1030d1f8397a45608716c4fa5a4c2bb4 DE-627 ger DE-627 rakwb eng TJ1-1570 S.C. Nwigbo verfasserin aut Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018) 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. Brazing alloys Experimental design Mechanical properties mild steel Temperature Torch brazing Zinc Mechanical engineering and machinery S.O. Mbam verfasserin aut C.U. Atuanya verfasserin aut In Tribology in Industry University of Kragujevac, 2012 36(2014), 3, Seite 326-338 (DE-627)687132940 (DE-600)2652232-9 22177965 nnns volume:36 year:2014 number:3 pages:326-338 https://doaj.org/article/1030d1f8397a45608716c4fa5a4c2bb4 kostenfrei http://www.tribology.fink.rs/journals/2014/2014-3/12.pdf kostenfrei https://doaj.org/toc/0354-8996 Journal toc kostenfrei https://doaj.org/toc/2217-7965 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 36 2014 3 326-338 |
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(DE-627)DOAJ017767911 (DE-599)DOAJ1030d1f8397a45608716c4fa5a4c2bb4 DE-627 ger DE-627 rakwb eng TJ1-1570 S.C. Nwigbo verfasserin aut Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018) 2014 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. Brazing alloys Experimental design Mechanical properties mild steel Temperature Torch brazing Zinc Mechanical engineering and machinery S.O. Mbam verfasserin aut C.U. Atuanya verfasserin aut In Tribology in Industry University of Kragujevac, 2012 36(2014), 3, Seite 326-338 (DE-627)687132940 (DE-600)2652232-9 22177965 nnns volume:36 year:2014 number:3 pages:326-338 https://doaj.org/article/1030d1f8397a45608716c4fa5a4c2bb4 kostenfrei http://www.tribology.fink.rs/journals/2014/2014-3/12.pdf kostenfrei https://doaj.org/toc/0354-8996 Journal toc kostenfrei https://doaj.org/toc/2217-7965 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_11 GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_370 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2027 GBV_ILN_2055 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 36 2014 3 326-338 |
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Development of Zn50 Brazing Alloy for Joining Mild Steel to Mild Steel (SAE1018) |
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This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. |
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This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. |
| abstract_unstemmed |
This work has developed new brazing alloys for joining mild steel to mild steel (SAE1018) at a lower temperature. The alloys blends and error analysis were done by experimental design software (Design Expert 8.0.7.1). Design of experiments was done by Scheffe quadratic mixture method. The liquidus temperatures were predicted by calculation of phase diagrams of the alloying metals. The brazing alloys were produced by gravity technique and melted using silicon carbide graphite crucible. The quality of the brazing alloys was analyzed by optical microscopy (OM), atomic absorption spectroscopy (AAS) and fourier transform infrared spectroscopy (FT-IR). Brazed joints were produced by torch method with a commercial flux. Brazing temperatures (liquidus) were tracked by a digital infrared/laser pyrometer. Some mechanical properties studied were tensile strength and hardness. Finally, brazed joints produced from the developed brazing alloys were compared to that produced from muntz brass. Six (6) brazing alloys were successfully developed. Zinc and manganese were the main components, to which were added; 3 to 4 %wt silver and 11 to15 %wt modifying element. The microstructure showed a typical eutectic structure with zinc-rich phase distributed uniformly in the matrix with a combination of different sizes of dendrite, rounded blocks of compounds and hypoeutectic structures. AAS results indicated minimal out-gassing of zinc and FT-IR results indicated very low presence of atmospheric gas. The range of brazing temperature for best results was recorded from 690.90 to 735.10 0C. The joints produced from the developed brazing alloys had acceptable strengths with improved stress-strain behaviour compared to muntz brass. |
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