d. Multiple Pass Welding
Butt Weld Joints When butt welding thicker materials; you will need to prepare the edges
of the material to be joined by grinding a bevel on the edge of one or both pieces of the
metal being joined. When this is done, a "V" is created between the two pieces of metal
that will have to be welded closed. In most cases more than one pass or bead will need to
be laid into the joint to close the "V".
Laying more than one bead into the same weld joint is known as a multiple-pass weld.
The illustrations in the following figure show the sequence for laying multiple pass beads
into a single "V" butt joint.
NOTE: WHEN USING SELF-SHIELDING FLUX-CORE WIRE it is very important to
thoroughly chip and brush the slag off each completed weld bead before making another
pass or the next pass will be of poor quality.
Fillet Weld Joints Most fillet weld joints, on metals of moderate to heavy thickness, will
require multiple pass welds to produce strong joint. The following figure will show the
sequence of laying multiple pass beads into a T fillet joint and a lap fillet joint.
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