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Limited cold bending can be performed on 17-4 PH Stainless steel in Condition A. For more severe cold working, the material may be heat treated to Conditions H 1100, H 1150 or H 1150-M. This will help prevent possible cracking. Stress corrosion resistance is improved by re-aging at the...

A welding symbol is specific for a particular weld joint only or when you have same weld types at different location, you can use same symbol by multiple arrow lines. The way you represented weld is not correct. You cant have different basic weld symbols on same reference line one after other...

As you mentioned already, the main difference is the Moly. Other point is strength. 316L has lower strength compared to 308L (for stick welding rods as per AWS A5.4). Additional this might be useful: Can you weld 316 with 308

You can weld a supplementary test coupon however it shall meet all the essential variables of the existing WPS.

You can use ER70S-6 for Tig root run. Ask the consumables supplier to provide the filler wire with -50 Deg impact and verify before use that its meet your specification. For fill and cap go with E-7018-1 as recommended by weldstan. You might get high hardness in the 4130 HAZ with coarse grain...

The recommended filler wire for P91 is E8018-B8. What the base for B9 recommendation? Any specific reason please

Ok, thanks to all of ur for ur very helpful post. can anyone please elaborate QW 407.1 a & b requirements in details please

Hi can anybody please interpertate ASME section IX clause 407.1. Also does 407.6 support, 407.1? i.e. 407.6 applies when 407.1 is applicable. thanks for your help in advance.