Posted by NCWayne on April 02, 2012 at 07:21:01 from (69.40.232.132):
In Reply to: Welding experts needed posted by Fritz Maurer on April 01, 2012 at 19:34:51:
I've brazed some relatively heavy castings over the years, and have watched the old fellow that used to be our 'go to guy', until he passed away, braze up even heavier castings like the one off of a press head he had in the shop some years back. In every instance the best was to heat the thing was one of the 500,000 BTU, propane, weed burners. Once you have the casting to say 300 degrees or so, it's not that hard to get the spot your brazing hot enough to melt the brazing rod. The main thing is to V out the crack and get everything as clean as possible before starting. I've found that the hydrocloric acid solution you can get that's designed for cleaning RV water tanks (I think that's the use listed on the bottle) does a really good job of getting cast clean enough so the braze will bond and flow properly. The pure stuff works great too but it's not readily available anymore like the dilute stuff is.
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