Hi weldstan,
Could you please tell me more info regarding to your welding procedures using ER70S-6 at -50 F with the GMAW process, such as shielding gas for GMAW-S and GMAW-P, heat input etc... Thank you.
Best regards - Ken
Yes, you are right. I have the experience that using GMAW-S for root pass and GMAW-P for fill and cap failed bending test. I try to find what are the root causes, heat input or shielding gas?
We have SMAW and SAW, but SAW cannot be used for 6G, SMAW is much slower than GMAW. As I said ER70S-6 we used has the C of C and C of welding testing which is for -50F. If the coupon we will make for PQR passes the -50F impact test, it complies with ASME sect IX.
Yes, normally ER70S-6 solid wire is for at -20 deg F, it is in ASME CODE. But our supplier can supply C of C and C of welding testing, which shows ER70S-6 can used @ -50 F and pass impact test @ -50 F. I believe that was done under Spray Arc mode. For me, I need Short Circuit for root pass and...
Does someone has experience of using MIG weld ( ER70S-6 wire ) to make a coupon to pass impact test @ - 50F? I know that MIG is NOT usually used for low temperature pressure vessel. Did someone ever try it? Using what kind of shielding gas? Thanks.
