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Location:
Finland
Registered:
June 2002
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Re: welding stuff to a cast exhuast manifold ??
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Wed, 30 October 2002 21:46
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This one professional welder told me that heat treatment _after_ welding does the trick.
He for example welded up this one truck exh header. He used stick weld, some kinda 'chrome'-stick.
Anyways, wlded the crack up, installed header, and used engine itself to do the heat treatment.
Switched engine on for 1 to 2 minutes, had it idling all time. Swicth off, cooling period. After a while, switch back to idle, leave it running longer, cool down again.
Work this way carefully towards normal temperatures.
Apparently if it has inbuilt stresses inside wlding, it'll crack during first time it's running. If it'll make trhrough one day, it won't (most likely) crack at weld seam.
He said that sometimes on construction sites they ne really long drill bits. Those are done on site. Just weld on a rod onto a drill bit. He said it's cruicial to use blow torch to after welding to heat it until dark red - then have it cool down slowly.
If after treatment not done - drill bit will eventually crack away from metal rod.
-A.
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