I need to MIG weld a stainless part. I have a Lincoln SP125+ welder, C25 , CO2, and argon gasses. I have 308L wire. I can't tig this because I cannot get the tig torch into the tight space. The welding is being done on a beer keg. At the top of the keg is a valve that has had the innards removed so now it is just a sleeve poking out of the keg top. Into the side of this sleeve I put a hole to accept the OD of a 3/4 pipe nipple. This nipple needs to be welded into the sleeve. I welded all the way around the nipple on the inside of the sleeve but the customer also wants the sleeve welded on the outside. The problem is that the pipe nipple is practically tangent to the domed top of the keg. I tried TIGging the nipple all the way around but can't get the tungsten into the really tight space where the nipple side practically touches the keg. I could do this with MIG though. Reading online at the Lincoln website I should be using no more than 3 % CO2 mixed with argon to do the weld. Pure argon is advised against. Will C25 really not work? This weld is really cosmetic because the internal weld is a good weld. The finished product will be part of a still for a new micro distillery and so it must look good. This is why the customer wants the outside weld and the customer is always right. Since the still will be used as part of a legal operation it will be showed off and may lead to other work. I am going to try to convince the customer to change the plumbing in the future but right now this one needs to be done the way the customer is asking. Thanks, Eric
- posted
8 years ago