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The table and pictures below detail common causes of weld defects.
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The weld was started correctly but completed too quickly. No wash indicates haste or too low a temperature.
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The hot-air tool was not allowed to attain the correct operating temperature and the weld was finished too soon, leaving a hole. |
Too much pressure has been applied to the rod leaving a low and deformed bead. Filling may be necessary. |
The welding temperature was too high, blistering the sides of the weld. The repair area may be brittle. |
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Welding Defects and Causes
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Poor weld
penetration
or poor
bonding
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--Incorrect weld site preparation
--Weld speed too fast/temperature too low
--Weld attempted with dissimilar materials
--Poor technique
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Uneven
weld bead
width
Charred
weld
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--Welding rod stretched
--Uneven pressure applied to welding rod
--Welding speed too slow
--Temperature too high
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| Warping |
--Repair area overheated
--Parts fixed under tension
--Poor site preparation
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