geesamand
Mechanical
- Jun 2, 2006
- 688
My company provides equipment in a variety of corrosion-resistant alloys.
We have done duplex in the past and had a few more mechanical failures (cracking) particularly around HAZs. Even with greatly reduced stress limits we couldn't stay out of trouble.
I have a few areas of focus to get back on track:
1) Design of the weldments for duplex welding heat control. Do certain weld joints lend to worse HAZ phase imbalance.
2) We generally use ASME BPVC allowable stress limits for design. Is this standard practice, and if so, are there cases where we shouldn't?
3) We subcontract welding. Many weld shops "have a procedure for that". What are key questions / criteria to get past the "we can do that" promise to actual success?
I realize these are loaded questions, so I'll take what I can get.
Thanks,
We have done duplex in the past and had a few more mechanical failures (cracking) particularly around HAZs. Even with greatly reduced stress limits we couldn't stay out of trouble.
I have a few areas of focus to get back on track:
1) Design of the weldments for duplex welding heat control. Do certain weld joints lend to worse HAZ phase imbalance.
2) We generally use ASME BPVC allowable stress limits for design. Is this standard practice, and if so, are there cases where we shouldn't?
3) We subcontract welding. Many weld shops "have a procedure for that". What are key questions / criteria to get past the "we can do that" promise to actual success?
I realize these are loaded questions, so I'll take what I can get.
Thanks,