ditchman Posted October 9 Report Share Posted October 9 2 hours ago, welsh1 said: Yoy can gas weld cast iron, but you need to clean it well bring it slowly up to heat in a blanket, weld it and then very slowly cool it with a heat blanket, but be prepared because the slightest breeze and you will hear the ping of it cracking. one of the hardest test pieces of my Military welding course was the cast iron. This is your best option, cover it with heated fire bricks when finished in a draught free area. i have heard that when larger castings (complicated ones) were mended as soon as the casting was welded it was covered with burning sawdust and left to burn out over a few hours....so the whole casting was stress relived at the same time... Quote Link to comment Share on other sites More sharing options...
welsh1 Posted October 9 Report Share Posted October 9 1 hour ago, ditchman said: i have heard that when larger castings (complicated ones) were mended as soon as the casting was welded it was covered with burning sawdust and left to burn out over a few hours....so the whole casting was stress relived at the same time... One of the jobs we had on my welding course was a big old cast iron lamppost from Chatham docks down the road from our Depot with cracks in it , to weld it we had to heat it up with ceramic blankets for a day, and then once welded the blankets were placed back on and it was cooled over a day and a half to prevent cracking. Quote Link to comment Share on other sites More sharing options...
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