Re: Re: Re: Powder spray torch ?

Posted by kyhayman on July 13, 2004 at 18:12:03 from (205.188.116.201):

In Reply to: Re: Re: Powder spray torch ? posted by Chuck in FL on July 13, 2004 at 12:14:26:

Metal needs to be clean of grease, oil, and anything flammable. Then grind it, lightly. You may find crazing (hair line cracks that will extend beyond the primary. I really like to drill a hole in each end of the crack. The mfg of the nickel rods I have been using (Lincoln Electric) says no preheat required but I have much better luck with than without. A lot is going to depend on if it is internal or external. External cracks are easy, all you are doing is trying to keep water in, deep fusion is not necessarily what you need. Main thing is keep the welds very short and let the metal cool (to the touch) if you cant preheat. In reality, it will probably be just as cheap to take the unit to a welding shop. By the time you buy a pound of rods (you will want to practice before you weld your block) for $25.00 you can pay a shop to do the job. Once you start, they may not take it. Inside cracks are definitely best left to others.

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