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Combination internal welder/line up clamp |
| The Combination
internal welder/line up clamp. It travels along the inside of the pipe, aligns the two
pipe ends with each other, clamps them into place and automatically welds the root bead on
the inside of the joint. Multiple welding heads are used for the 24 to 60 inch pipe. For
example, a four headed machine begins welding with two heads at the 12 and 3 o’clock
positions. These heads weld downhill to 3 and 6 o’clock, respectively.
Simultaneously, the other heads are moving into position at 12 to 9 o’clock and then
weld the other side of the pipe. On a 42 inch diameter pipe, the root pass weld time is
less than 1.5 minutes.
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