Enclosed Tanks

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Hey guys just after some different opinions when TIG welding Aluminium tanks together. My problem I have is when they are a totally sealed tank I get a lot of Blowback from hot gasses trying to escape at the very end of the weld. What do you guys do?
Reply:Originally Posted by WeldworxHey guys just after some different opinions when TIG welding Aluminium tanks together. My problem I have is when they are a totally sealed tank I get a lot of Blowback from hot gasses trying to escape at the very end of the weld. What do you guys do?
Reply:Originally Posted by WeldworxHey guys just after some different opinions when TIG welding Aluminium tanks together. My problem I have is when they are a totally sealed tank I get a lot of Blowback from hot gasses trying to escape at the very end of the weld. What do you guys do?
Reply:Hey guys thanks for your replies!!  Yeah I was just asking in general but i made some Ally cubes in the past to put into a fuel cell in a Ferrari to reduce the fuel volume in the tank to make it race legal. But as for letting it cool down, I have heard that before and have seen people do it but I just cant quite master it myself !!!!
Reply:So many ways to stray off thread here with questions and comments.....Without knowing the size or purpose, I'm just shooting in the dark but suppose you have a small hole drilled somewhere appropriate to relieve the pressure while you finish the seam. Then, set the tank in some cold or even ice water to chill the air inside and cause the pressure to start dropping; while that's happening, quickly make the weld over the hole, timing things so the air flow will be close to zero as the metal flows.If this is a production job, you might be able to use a clock to determine how long to cool it or when to start the last weld.Of course, you might suck the weld metal in instead, if your time is off.
Reply:Had the same problem on a pipe once, drilled a hole on the other side which solved the problem, but I didn't like the hole.Thought about it and next time I'll try heating the other side with a gas torch, remove torch, start welding the gap and maybe the cooling of one side will just compensate the heating of the other side so the pressure inside will be neutral.If I'll overdo it, the sucking in of air will be the next problem... Bit tricky I guess.
Reply:what about when your just about to seal the box hitting it from the other side with C02 to try and chill the air to where its contracting not expanding?   maybe weld all but 1/4" then chill then try and shock it with the cold right before you seal it up.  Best done with a partnerVantage 500's LN-25's, VI-400's, cobramatics, Miller migs, synch 350 LX, Powcon inverters, XMT's, 250 Ton Acurrpress 12' brake, 1/4" 10' Atlantic shear,Koikie plasma table W/ esab plasmas. marvel & hyd-mech saws, pirrana & metal muncher punches.
Reply:Thanks guys. I will give it a shot!
Reply:question what is it for ?? some kind of floatation?
Reply:letting it cool down a few minutes is the simplest answer.