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Science Forum Index » Engineering - Joining (Welding) Forum » Is it just me?
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| Dixon |
 Posted: Wed Jan 31, 2007 12:42 pm |
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Why is it when tig welding, if the work on the bench is not sitting flat, so
it can rock or wobble, it goes into a motion that makes you almost have to
chase it? I've seen almost 1/4" movement of the part at the weld area.
Dixon |
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| Potblak |
| Posted: Wed Jan 31, 2007 7:21 pm |
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Guest
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Magnetic forces generated by the welding current.
If the part is moved one way due to 'arc blow', the return current path will
shif from its original place, and the new return path will generate a
different force and a new movement.
Solution is simple.
Clamp it.
"Dixon" <dixon263@comcast.net> wrote in message
news:gsidnVN7T9R1W13YnZ2dnUVZ_veinZ2d@comcast.com...
Quote: Why is it when tig welding, if the work on the bench is not sitting flat,
so it can rock or wobble, it goes into a motion that makes you almost have
to chase it? I've seen almost 1/4" movement of the part at the weld area.
Dixon
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| Ernie Leimkuhler |
| Posted: Thu Feb 01, 2007 1:52 am |
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Guest
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In article <gsidnVN7T9R1W13YnZ2dnUVZ_veinZ2d@comcast.com>,
"Dixon" <dixon263@comcast.net> wrote:
Quote: Why is it when tig welding, if the work on the bench is not sitting flat, so
it can rock or wobble, it goes into a motion that makes you almost have to
chase it? I've seen almost 1/4" movement of the part at the weld area.
Dixon
Arc-force and electromagnetic effects can easily move small pieces.
One simple solution is a "finger".
A finger is a simple tripod device that holds small parts down to the
table.
Picture a steel rod 12 inches long.
At one end the rod is bent so it has a 3 inch leg.
This leg is ground to a point.
At the other end of the main length is a fork with two 2" legs.
The idea is that if this piece is resting on a table, all 3 ends rest on
the table.
All it needs now is a chunk of steel that weighs a few pounds tack
welded above the 3 inch pointy leg.
Use the pointed end to hold down small parts. |
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