Mixed weld electrodes design question
Mixed weld electrodes design question
(OP)
I specified 1/4" E70XX fillet welds for a pipe rack, but the guys who did it only had a pressure piping spec for a full penetration groove weld that called for one pass with an E60XX then the top pass with an E70XX.
So these guys tried to apply that technique to the fillet weld and they mixed E60 and E70 electrodes, I guess by making the first pass with the E60, then filling the rest out with the E70.
I'm not totally up to speed when it comes to welding procedures in the first place. I just say, "Make a 1/4" fillet weld, you follow AWS or whatever you need to do to conform to the standards, and don't bother me about it." But now they did this weird thing and I need to figure out if it's okay. Should I just check the welds assuming a 60 ksi Fw?
So these guys tried to apply that technique to the fillet weld and they mixed E60 and E70 electrodes, I guess by making the first pass with the E60, then filling the rest out with the E70.
I'm not totally up to speed when it comes to welding procedures in the first place. I just say, "Make a 1/4" fillet weld, you follow AWS or whatever you need to do to conform to the standards, and don't bother me about it." But now they did this weird thing and I need to figure out if it's okay. Should I just check the welds assuming a 60 ksi Fw?






RE: Mixed weld electrodes design question
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RE: Mixed weld electrodes design question
RE: Mixed weld electrodes design question
RE: Mixed weld electrodes design question
They just did it this way because someone doesn't know what they're doing over there.
RE: Mixed weld electrodes design question
Since the welders normally weld pressure piping, there is some logic to their process and procedure. On a highly restrained joint they often want to use a slightly softer filler metal for the root pass, to prevent root cracking. Then they switch to the higher strength filler metal for the joint strength, knowing that the mixing will bring the root pass up a bit, in strength. The reasoning is that you loose very little in strength but prevent cracking in that difficult first pass region.