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4. Setting up the work piece
Welding positions
There are two basic positions, for welding: Flat and Horizontal. Flat welding is
generally easier, faster, and allows for better penetration. If possible, the work
piece should be positioned so that the bead will run on a flat surface.
Preparing the Joint
Before welding, the surface of work piece needs to be free of dirt, rust, scale,
oil or paint. Or it will create brittle and porous weld. If the base metal pieces
to be joined are thick or heavy, it may be necessary to bevel the edges with a
metal grinder. The correct bevel should be around 60 degrees. See following
picture:
Based on different welding position, there are different welding joint, see
following images for more information
Ground clamp connection
Clear any dirt, rust, scale, oil or paint on the ground clamp. Make certain
you have a good solid ground connection. A poor connection at the ground
clamp will waste power and heat. Make sure the ground clamp touches the
metal.
Setting the wire tension
Arc flash can injure eyes! To reduce the risk of arc flash, make certain that
the wire coming out of the end of the torch does not come in contact with
work piece, ground clamp or any grounded material during the drive tension
setting process or arcing will occur.
•
Press the trigger on the torch.
•
Turn the drive tension adjustment knob clockwise, increasing the drive
tension until the wire seems to feed smoothly without slipping.
ENG
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