I am helping a fab shop qualify a WPS and I realize there are other easier ways of doing this, but I have the weld coupons in hand and am going to test them. I'm looking for advise on root bend tests. Here are the details:
7/8" diameter pipe with 0.125" wall thickness.
Partial penetration weld...
Anyone with experience looking at sigma phase able to give an opinion on whether or not this is it starting at the grain boundaries? Midwall of a 0.5" thick plate; around the edge of the HAZ. Etched with 20% oxalic for about 20 seconds at 5V. 250X magnification. I'm wondering about the "growths"...
I tried to attach two micro photos, but I think only one is being attached. There is no scale bar, but it is taken at 100X magnification with Vilella's etchant. This micro is taken at the mid-thickness of the second layer of a CCO. I've circled two regions in yellow that I am curious about. I am...
Could someone explain to me why "stress relieving" is sometimes performed after quench and tempering by the manufacturer? The material in question is 4130. I've noticed that sometimes the MTRs state a stress relief at slightly lower temperature, but similar time to the temper temperature and...
Anyone know where I could find an official specification for this material? I can find plenty of unofficial chemistry tables, but I would like to have the actual original specification. I've found reference to DIN 1.6761, but I can't find this document either.
I saw this question was asked previously, but I wasn't quite satisfied with the answer.
I've been doing some digging and can't determine the difference between PTAW and PAW. I read that the T is whether "it" is transferred and I have concluded that "it" is the arc that is transferred, but I...
I have a client who had their 17-4 PH component (part of a drive roll) improperly heat treated. It was meant to be H1075, but ended up getting 1150F for 2 hours and then furnace cooled. I suggested they take a bar, heat treat it in the same manner as the improper heat treatment and tensile test...
This is my first vessel I have designed and probably my last. We are wanting to build a vessel for pressure testing (with water) downhole tools. The ID of the vessel would be 6 inches and 8 feet long. The maximum pressure we would need to test at would be 20,000 psi at room temperature. This...
