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welding a shaft
Posted: Fri Jul 26, 2019 1:25 pm
by mikechoochoo
I want to weld a piece onto the the screw from a vise, it's about 3/4 inch diameter. The weld will be two inches from the threaded portion and will be replacing a old botched repair done by a previous owner. I plan on making the new part slightly larger than the final diameter and turning it to size after the welding is done to account for warpage. The question is should I weld a scarf joint or a but joint that is v'ed with the parts center drilled with a pin to hold their alignment . Yes I could turn a whole new screw but it's a buttress thread and I feel welding is the easier course.
Mike N.
Re: welding a shaft
Posted: Fri Jul 26, 2019 5:53 pm
by Russ Hanscom
My personal preference is to make a V joint. I use a piece of angle iron to maintain alignment; clamp the pieces into it. Shim one side if the diameters are different. Make a pass, flip and make a pass, repeat as necessary. Should be able to keep it relatively straight.
Helps to put a rib on the back of the angle for clamping it in a vise and also helps to cut away of bit of the angle sides near the welding area for better access.
Re: welding a shaft
Posted: Fri Jul 26, 2019 6:29 pm
by LIALLEGHENY
I agree with Russ, make a V-joint.
Nyle
Re: welding a shaft
Posted: Sat Jul 27, 2019 10:08 am
by Russ Hanscom
This is my basic fixture. Make one suitable to your needs.
Re: welding a shaft
Posted: Sat Jul 27, 2019 5:10 pm
by johnfreese
Make the extension considerably oversized and the need for accurate alignment goes away. Definitely use a V groove.