Posted by NCWayne on April 19, 2008 at 08:57:20 from (166.82.206.74):
In Reply to: welding help advice posted by hay on April 19, 2008 at 07:49:48:
I routinely braze hydraulic tubing that gets a hole worn into it from rubbing against other pipes and lines. They're often on older machines where parts are no longer available or in applications where it just isn't feasible to take the tube out and replace it due to time constraints or the amount of work/dissasembly needed to get that line out. In fact I rebrazed one the other day that is on a 1" pressure line going to a hydraulic hammer on a rock drill. I say rebrazed because I first brazed it about 4 years ago because of a hole worn into it due to a loose line clamp and it just wore a hole back in it again in nearly the same spot. This line sees 2500PSI under a high pulsation usually 8 hours a day and hasn't leaked a drop since the first repair til this recent new abrasion. That said drain all the oil you possibly can, wrap anything you don't want to get hot in wet rags, clean and flux the area good and put a dot of braze on it. The braze is gonna be better than the weld because the torch will burn the oil off or the braze won't flow out and stick. In my experience the weld since doesn't put down any significant amount of heat before it sticks so when it does stick the area will probably still have some oil infused into the metal. This unseen oil can cause the weld to stick in one place and not in another. When your talking about just a tack that is the worst kind of weld anyway because of the lack of surface area of the weld and lack of enough heat put into the weld to get really good penetration/adhesion this results in part of the weld sticking and part not. What I see from repairs like this is often it just leaves another leak, often larger than it origionally was.
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