WG3020
Welding Guidelines (Continued)
WELDING POSITIONS
Four basic welding positions can be used; flat, horizontal, vertical, and overhead. Welding in the flat position is easier than any of the others because welding speed can be increased, the molten metal has less tendency to run, better penetration can be achieved, and the work is less fatiguing. Welding is performed with the wire at a 45º travel angle and 45º work angle.
Other positions require different techniques such as a weaving pass, circular pass, and jogging. A higher skill level is required to complete these welds.
Figure 12 - Multiple Weld Passes
PULL
Figure 13 | PUSH |
Overhead welding is the least desirable position as it is the most difficult and dangerous. Heat setting and wire selection will vary depending upon the position.
All work should be performed in the flat position if possible. For specific applications, consult an arc welding technical manual.
WELD PASSES
Sometimes more then one pass is necessary to fill the joint. The root pass is first, followed by filler passes and the cover pass. If the pieces are thick, it may be necessary to bevel the edges that are joined at a 60º angle.
NOTE: Remember to remove the slag before each pass for gasless process.
Cover
Filler
Root
Figure 11 - Weld Passes
PUSH VS PULL TECHNIQUE
The type and thickness of the work piece dictates which way to point the gun nozzle. For thin materials (18 gauge and up) and all aluminum, the nozzle should point out in front of the weld puddle and push the puddle across the workpiece. For thicker steel, the nozzle should point into the puddle to increase weld penetration. This is called backhand or pull technique
(See Figure 13).
ALUMINUM WELDING
Any aluminum surface to be welded, must be cleaned thoroughly with a stainless steel brush to eliminate any oxides on the weld and grounding surface. 100% Argon must be used when welding aluminum. If Argon is not used, metal penetration is unlikely.
Supply Cable
Replacement
1.Verify that welder is OFF and power cord disconnected.
2.Remove welder cover to expose the ON/OFF switch.
3.Disconnect the black and white power cord wires connected to the ON/OFF switch.
4.Disconnect the green power cord wire connected to welder frame.
5.Loosen the cord strain screw(s) and pull cord out of strain relief.
6.Install new cord in reverse order.
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