Dear Venkatesh,
Yes Welding is permitted . It really depends on what temper treatment was used for the casting, and what are the desired mechanical properties. In general, normal precipitation heat treating temperatures (150-245 C) are too low to provide appreciable stress relief on quenched or welded parts. Annealing at 315-345 C for 2-4 hours (O temper) provides maximum stress relief of castings, but has significantly lower mechanical properties than a typical solution treated + artificially aged (T6) temper. The following is an excerpt from the article "Aluminum and Aluminum Alloy Castings" that appears in ASM HANDBOOK Volume 15 (2008) Casting:
Postweld Heat Treatment. Castings that require heat treatment should be heat treated after welding. Castings taht have been heat treated and then welded will suffer localized loss of tensile properties and an increase in localized residual stresses. However, postweld heat treatment will restore their properties if the proper filler alloy has been used in welding." WKT mentioned, it really depends on what temper treatment was used for the casting, and what are the desired mechanical properties. In general, normal precipitation heat treating temperatures (150-245 C) are too low to provide appreciable stress relief on quenched or welded parts. Annealing at 315-345 C for 2-4 hours (O temper) provides maximum stress relief of castings, but has significantly lower mechanical properties than a typical solution treated + artificially aged (T6) temper. The following is an excerpt from the article "Aluminum and Aluminum Alloy Castings" that appears in ASM HANDBOOK Volume 15 (2008) Casting:
Postweld Heat Treatment. Castings that require heat treatment should be heat treated after welding. Castings taht have been heat treated and then welded will suffer localized loss of tensile properties and an increase in localized residual stresses. However, postweld heat treatment will restore their properties if the proper filler alloy has been used in welding."
Postweld Heat Treatment. Castings that require heat treatment should be heat treated after welding. Castings taht have been heat treated and then welded will suffer localized loss of tensile properties and an increase in localized residual stresses. However, postweld heat treatment will restore their properties if the proper filler alloy has been used in welding." WKT mentioned, it really depends on what temper treatment was used for the casting, and what are the desired mechanical properties. In general, normal precipitation heat treating temperatures (150-245 C) are too low to provide appreciable stress relief on quenched or welded parts. Annealing at 315-345 C for 2-4 hours (O temper) provides maximum stress relief of castings, but has significantly lower mechanical properties than a typical solution treated + artificially aged (T6) temper. The following is an excerpt from the article "Aluminum and Aluminum Alloy Castings" that appears in ASM HANDBOOK Volume 15 (2008) Casting:
Postweld Heat Treatment. Castings that require heat treatment should be heat treated after welding. Castings taht have been heat treated and then welded will suffer localized loss of tensile properties and an increase in localized residual stresses. However, postweld heat treatment will restore their properties if the proper filler alloy has been used in welding."
On Sat, Apr 10, 2010 at 7:44 AM, Venkatesh <vpv_333@yahoo.com> wrote:
Thanks & Regards
P.Venkatesh
Get your preferred Email name!
Now you can @ymail.com and @rocketmail.com. --
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
--
Yadav Shiva Chelliya,
Inspection Engineer,
Doha Qatar,
+974-6166465
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
No comments:
Post a Comment