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Thread: Welding Mercury cast aluminum
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08-21-2009, 01:52 PM #1Member
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Welding Mercury cast aluminum
Hi I have a small weld to do on a 1/4 inch piece of Aluminmum on a Sport Jet pump housing. I have a TIG machine but hope to do it with out removing it from the boat which means I will have to do it upside down. I am sure it is the same material as all of there Gear cases and was looking for tips as far as Prep filler Material etc. Thankyou.
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08-21-2009, 02:17 PM #2Supporting Vendor
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I brush the Alum to be welded with a SS brush, clean of completely with acetone and heat up the area before firing up with tig. I use heli arc alum. rods ( I think I remember ) in the 3000 series I find it to be easier to tie in with a bit lower melt temp to the cast alum trash metal....
Good luck,
JayJay @ JSRE
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08-21-2009, 02:32 PM #35000 RPM
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AMEN to all of that. just one trick to add. when the area has been pre- heated check to see how much trash is still in the metal.
there have been a couple of times that i had to really cook cast alum. one was a truck manifold . it had to cook at 900 degrees for about 7 hrs before it was clean enough to weld