Welding Truck Diesel Tanks

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Well this week had a couple of diesel tank to weld up. One is a repair at the strap section, and the other one needed to be shortened 28 inches.
Reply:Here's a technical question though. Is there a way to restart a weld without having a white spot to show it on the previous weld? I was crazy enough in the past to try welding 2 stick of filler tube together to reduce stop/ starts. Downfall with that is that on thin filler, its extremely flexible and becomes hard to control.
Reply:Get set up so you can grab the next piece of filler WITHOUT stopping the arc and re-starting it.Works every time..When you get good enough you should be able to start and stop any weld anywhere without being able to tell where you did...But in the mean time try the first suggestion....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:what zap said. I do that all the time set up were you know where the wire is laying at and then let off the pedal a bit when you use up the first piece of wire then grap the other then go back at it.
Reply:Hmm never thought of doing that, certainly a good tip! But for something like this, I can't move all around the piece in one shot neither ( I don't have a positioner). I've tried everything on the restarts to not show it, should I be cleaning up each time is stop?
Reply:is there a process to clean these tanks before welding, if there is diesel residue is it possible for the tank to ignite and explode?
Reply:I don't clean them at all, alot of times there's still 1/4 of tank of diesel even in there. Diesel doesn't ignite like gasoline. One thing you do have to make sure of though, is to have lots of ventilation. So I always keep the filler open to let the air escape to not build all the pressure in there. Gasoline tanks still scare me till this day. I've only done a handful, but I normally need to keep the tanks for atleast a week with fresh air blowing inside the tank quite a few days to get all the gasoline out. Also, if its nice and hot outside, I'll let it air out outside in the sun to further help it evaporate everything.
Reply:I forgot to hit quote.Last edited by LawsonWeldingLLC; 09-05-2012 at 07:16 PM.I forgot how to change this.
Reply:Originally Posted by dj55bI don't clean them at all, alot of times there's still 1/4 of tank of diesel even in there. Diesel doesn't ignite like gasoline. One thing you do have to make sure of though, is to have lots of ventilation. So I always keep the filler open to let the air escape to not build all the pressure in there. Gasoline tanks still scare me till this day. I've only done a handful, but I normally need to keep the tanks for atleast a week with fresh air blowing inside the tank quite a few days to get all the gasoline out. Also, if its nice and hot outside, I'll let it air out outside in the sun to further help it evaporate everything.