Kubota exhaust manifold

Oct 15, 2003 3 Replies
J

This past weekend I made a stupid move. I was pushing some downed tree branches with my loader when one of them fell against the vertical exhaust pipe. The torque transferred into the exhaust manifold which broke it. My experience with welding cast iron is limited to handrail work.



I would like advice on welding this manifold. I have TIG and Stick machine. A Miller Dynasty 300 inverter.With a water cooled TIG torch. 100% Argon shielding.



I would like to know, should I preheat the manifold? What filler rod should I use?



The biggest job may be removing the manifold without breaking the bolts.



John



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E

V-grind out the crack Preheat the whole piece to about 500-600 DegF Weld in short stitches using pure Nickle TIG rod Pean each stitch as it cools When done allow the whole piece to cool slowly.

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J

when you say, pean each stitch, you mean to weld a short pass, then while it is still red, pean that spot? should I then continue immediately after each pean? John

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E

Yes, the idea is to streth the weld a bit so it doesn't shrink and fracture the surrounding cast iron.

Allow each bead to cool down enough so it isn't glowing before laying the next one. The idea is to keep your overall heat very low by not getting in a hurry.

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