Pipe Welding

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is the hotpass supposed to be uphill or downhill in pipe welding?

So i've always done the hotpass downhill in plate welding but I was told that you should do it uphill in pipe. i was doing all the other passes uphill except that one. Now that someone told me I need to do it uphill I'm having trouble getting it to flatten out.

I worked with two experienced pipe welders for many years. Our standard for pipe work (except pipelines) was uphill but these two guys said that the root pass could be downhill but after that all of the passes must be uphill. The idea is you have to carry a larger puddle of molten metal. That flushing out slag better and also mixes the weld rod material with the parent metal better.

They also required the hot pass to be ground before beginning the filler passes. Again to aid in flushing out slag. Because all of our piping was critical, each weld had to be 100% Xray quality and the procedure reduced the amount of repairs needed.

Note: To meet code requirements, the welding procedure should spell out the direction for the various passes. If the procedure only states the direction once then that direction should be followed for all passes including the stringer.

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Jackson Safety 4 Jumbo Contour Marker 14773 Aluminum For Pipes 8  48 1
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6 Piece PIPE PRO Magnetic Metal Pipe Cutting Guide Kit Steel
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Pipe Pro MEKIT Metal Cutting Guide Set Steel
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