Metal Inert Gas (MIG) welding performs a small weld on round pipe using a thin wire electrode. The feed rate of the electrode remains consistent during the welding process, keeping the weld uniform around the circumference of the pipe. Before MIG welding the round tubing, the tubing must be straight and the walls of the tubing aligned. If the tubing is not true, the interior of the tubing will be offset and disrupt the flow of liquids or gases passing by the MIG welded joint.
- Skill level:
- Moderately Challenging
Things you need
- Pipe stands (4)
- 4-foot level
- Combination square
- MIG welder
- Welding hood
- Leather welding gloves
- Wire brush
Place two pipe stands 12 inches apart with the centre of the heads aligned.
Set one end of one length of round tubing onto one of the pipe stand heads. Let the other end of the tubing rest on the ground. Repeat the process with a second length of round tubing on the second pipe stand.
Lift each end of the round tubing off the ground and slide a pipe stand under the end of each pipe. Place the 4-foot level on top of the first length of pipe. Adjust the heads of the pipe stands until the round tubing is level. Perform the procedure on the second length of pipe.
Slide the two lengths of round tubing until the ends of the tubing are 1/16 inch apart.
Place the combination square against the side of one length of pipe. Slide the combination square over the 1/16-inch weld gap and onto the other length of pipe. If the blade of the combination square catches on the pipe, move the pipe stand until it passes over the connection smoothly.
Move the combination square to the other side of the tubing and repeat Step 5. Both lengths of pipe need to be aligned, level and square before continuing.
Turn on the MIG welder. Adjust the welder to the thickness of the round tubing.
Put on a welding hood and leather welding gloves.
Align the wire protruding from the MIG gun with the centre of the 1/16-inch weld gap, lower your welding hood, and pull and hold the trigger of the MIG gun for two seconds to place a tack weld on the 1/16-inch weld gap.
Roll the tack welded pipe 180-degrees and place another tack weld. Continue rolling and tack welding the weld joint until you have one tack weld placed every 1 to 2 inches.
Rotate the round tubing as you weld around the tacked weld gap.
Remove the discolouration from the weld with a wire brush after the welded joint has cooled to room temperature.
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