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.
welding a shaft
Moderator: Harold_V
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- Posts: 1955
- Joined: Wed Mar 15, 2006 11:10 pm
- Location: Farmington, NM
Re: welding a shaft
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.
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.
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- Posts: 368
- Joined: Sat Jan 11, 2014 12:36 am
- Location: Bohemia, NY
Re: welding a shaft
I agree with Russ, make a V-joint.
Nyle
Nyle
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- Posts: 1955
- Joined: Wed Mar 15, 2006 11:10 pm
- Location: Farmington, NM
Re: welding a shaft
This is my basic fixture. Make one suitable to your needs.
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- Posts: 219
- Joined: Thu Jan 21, 2016 2:10 am
Re: welding a shaft
Make the extension considerably oversized and the need for accurate alignment goes away. Definitely use a V groove.