How to Weld Aluminum Pipe
Aluminum pipe is frequently used for heat transfer in refrigeration systems because of its heat dissipation properties. While the procedures used to weld aluminum pipes are generally the same as those used to weld pipes made from other materials, aluminum requires some additional skill, preparation and techniques to ensure a clean weld.
Other People Are Reading
Things You'll Need
- Protective equipment
- Aluminum pipes
- Grinder or machining tools
- Degreaser
- Stainless steel wire brush
- Heater
- TIG welding equipment
- Argon shielding gas
- Filler material
Instructions
-
-
1
Bevel the edges of the aluminum pipe using a grinder or machine tools. Aluminum piping requires a wider channel ground into the pipe edge so that the groove between the pipe sections is shaped more like an inverted trapezoid as opposed to the standard triangular groove. The root faces are protruded more in the case of aluminum pipe and must be closely aligned.
-
2
Clean the edges of the pipe with a degreaser to remove oils and particulates, then use the stainless steel wire brush right before welding to remove any oxides that have built up on the surface.
-
-
3
Fit up the aluminum pipes so that the edges are closely aligned. Use the heater to preheat the aluminum piping to about 200 degrees Fahrenheit.
-
4
Add four evenly spaced tack welds at the root of the groove, verifying alignment after each tack weld is created.
-
5
Lay down a single weld bead around the joint of the pipe. Depending on the orientation of the pipe, either an uphill or a downhill welding process will be used.
-
6
Continue to add individual beads around the pipe until the groove is filled.
-
1
Tips & Warnings
All welders should wear protective equipment, including mask, gloves and apron/coveralls.
