#11
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straightedge, pushing, torch flame
Bernt,
On long flat panels with old damage you have to use a long straightedge for checking the length of the panel as you work it. Second, using a push to hold the panel is vital. You can use a board to push with, for support along a length - avoids pushing bulges. Third, check for tight and loose spots with the torch flame. If a spot tightens with heat then stretch it. If the spot loosens, then shrink it. The flame will show you a lot as you pass it over half-foot areas, looking for swelling, sinking, or no change. (I've done a lot of this work, on both steel and aluminum.)
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Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#12
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Kent,
Very interesting information about using the torch to find loose and or tight area's. Thank you for that tip
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Dave Bradbury |
#13
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As mentioned, get the ridges perfect first. Can pull out a lot of the low crown areas with it.
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Marcus aka. Gojeep Victoria, Australia http://willyshotrod.com Invention is a combination of brains and materials. The more brains you use, the less materials you need. |
#14
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The arc is truncated.
This recess was created when the internal arc was repaired. After cooling down, you get shorter. If you release tension in the arc - the arch elongates the depression disappears. I think you must to cuting ......
You can not weld this part at once. You must weld yourself gradually. Provide 15mm C02. Then weld the gas or Tig. Gradually, do not heat too much. When will you must cuting it three times, you'll know what's you doing wrong. But good work. You to continue.
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Jaroslav |
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