shaft fix...

[Shade Tree Welder]

Well my buddy Bob, call last night (which translates to something got f'd up and he needs me to weld it.) And again this is the case, Bob owns a small machine shop.

These are shafts for the turkshead on a tube mills. They are 4340 hardened steel. They rough machined the parts and sent them out for heat treat and only on getting them back did Bob's employee realized he cut too much off.

I tigged them up with 80S-D2 wire and tried to keep the heat down as much as possible to keep them from getting annealled.

[Shade Tree Welder]

And some more...

it was a total of 8 parts the shoulder was cut about 0.100" too deep. Thats quite a bit to weld up on a relative small part and trying not to effect the HT of it.

2 parts gave some trouble with porosity but the other 6 didn't dunno why.

[digr]

Looks like you saved the day again

[midmosandblasting]

Good blast job. Looks like you got all the discolor out of the weld seam.

[precisionworks]

Very nice

[Jeff]

Looks like some good work, as usual.

[weldor2005]

Well shade, recently, and that means a year ago, i took a tool and die welding class. Anywise i was wondering about how you said that you were trying to keep the heat down not to anneal the project, even though it would temper it anywise. but what really concerned me was what you did about preheat and interpass temperature of the part so that the part wouldn't crack? Just an interest. Nice looking welds.

[Shade Tree Welder]

Originally Posted by weldor2005

... Anywise i was wondering about how you said that you were trying to keep the heat down not to anneal the project, even though it would temper it anywise. but what really concerned me was what you did about preheat and interpass temperature of the part so that the part wouldn't crack?

well, it was a "hell lets try this approach. " Job

1. some of the parts were already attempted to be MIGed. no cracking so I wasn't too worried about cracking.

2. preheat in 250F rod oven, for half a six pack ( ya it was one of those jobs....)

3. when it was cool enough to handle with TIG glove it was cool enough for the next pass.

[weldor2005]

well i suppose that makes more sense to me. sounds good enough, or at least better than what the average joe might've done. good work. thanks for clarifying.