Mayf, Try putting the manifold in the oven and heating it up to around
450--weld some--clean it up with a new clean ss brush--back into the oven for a
re heat.--I have watched Kevin Self -- it goes in an out of the oven--as he
fabricates a manifold. wmts
>
> From: "DrMayf" <drmayf@teknett.com>
> Date: 2003/01/04 Sat PM 12:18:57 EST
> To: <land-speed@autox.team.net>
> Subject: My Welding Topic...
>
> Many thanks to all who replied! I appreciate it. History of the manifold: I
> bought it on ebay. It had been painted black. I used an aircraft paint
> remover to clean that off. Then I had it media blasted. It looked virutally
> new. Inside looks new. I made a jig and drilled the holes for the bungs.
> Made a fixture to hold them in place while welding. Used alcohol to clean
> rods and around where is was welding. Used a new grinder, bought just for
> this purpose (30 bucks) for shaping tungsten tips. Ground a ball on the
> electrode (maybe this is first mistake). Cranked the argon up to 18 cfm. My
> instruction book says that is the right range. Turned the amps up a LOT (old
> weldor told me 1 amp per mil of thickness). Bought an old manifold at the
> junque yard to pratice on. It was scaly but not grungy with oil. I managed
> to weld on it so so. So I tackled the real manifold. Bushwa...looks like
> chicken droppings everywhere. The tig tip looks like crap. My steel welding
> looks great in the arc, but not this. I can see the puddle forming then it
> gets scummy and nothing flows. Like brazing with a brass rod and no flux.
>
> So, I will try again. I will melt a new ball on the electrode. I will heat
> the snot out of the manifold with a torch to force any oils out and to burn
> them off. While it is still hot, I will try again. I have them stuck on well
> enough now that I could epoxy the remainder and/of use that aluminum brazing
> junk to fill in. I use a Lincoln Sq Wave 175, TIG setting, AC setting and
> about 150 amps.
>
> Any other thoughts? I'll keep all posted on new results...maybe MOnday.
>
> mayf, the aluminum challenged weldor in PAHrump...
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