There are rivted tank first course is replaced and in the region of T weld will be welded by cold welding to different thickness between first course and the second?
Still no one understands you, nor will you ever understand us I guess. Not being sarcastic, but some basic english may help you getting your way around here, and gain mutual understanding, so we can help you.
Hopefully youll understand this.
From the photo provided, it appears you wish to butt weld an area of the tank wall to connect two existing butt welds along the same horizontal joint, and which must include a vertical riveted lap joint between two plates on one side of the weld joint. As others pointed out, there is no such thing as a "cold weld". Fusion welds require heating the materials within the weld zone to above their melting point.
With your situation, since you have already done quite a bit of welding either side of the location in question, I can't see a problem with using the same weld process to complete the joint. Is your concern about any potential distortion/leakage the welding might produce in the existing riveted lap joint?
Thanks tbuelna what about different thickness ,second course is double thickness of first course and,procedure of company is 1_ we will weld with electrode 2.5mm 7018
2_cold weld by material like epoxy
I don't understand this procedure ?
I would imagine that you would use the same weld procedure for the remainder of the weld. At the location of the riveted lap joint, you only need to butt weld the lower panel to the inner flange of the riveted lap joint, since that is the interface that forms a seal. You can bevel the outer flange of the lap joint enough such that the initial weld pass(es) only joins the inner panels. Then you can make a final weld to secure the outer flange.
If the riveted lap joints were good enough to seal the tank before, the weld repairs you are adding should not affect them.
