Spot Welder
Make: Miller
Model: LMSW-52
Ace: Levi Gibson (lgibson19@georgefox.edu).
Location: Welding Shop
Resistance spot welding is a process in which contacting metal surface points are joined by the heat obtained from resistance to electric current. The Miller LMSW-52 Air-Cooled Spot Welder is a lightweight unit that is portable, easy to operate and excellent for welding mild, galvanized or stainless materials.
Description
- LMSW-52 spot welder manual [1]
Here is an example of spot welding and some good basic information.
Documentation
Terminology
- Tongs-
Training
Operation
Here are some general setup rules of thumb:
- The CFH gas setting should be roughly 2x the weld cup size. If you were to use a #7 cup the gas flow should be set to 14 CFH.
- The tungsten stick-out from the cup should be no more than the cup diameter. Using a #7 cup would allow for a maximum tungsten stick-out of 7/16"
Demonstration
The demonstration consists of two parts. For the first part you will need to setup the welder and safely attempt to weld a bead. The second part will require you to show knowledge of safely using the grinder and successfully grind a point on a tungsten rod.
General Procedure
- Ensure the material being welded should be clear of any oil or dust
- Turn on the spot welder
- Place the material being welded between the clamps.
- Clamp down on the two pieces of material for no more than 5 seconds.
- Grab workpiece with a set of pliers, and open the clamp.
Safety
- Don't exceed gas pressure past specified value
- Don't weld with gas off
- Always use a welding helmet and proper PPE
- Don't weld in wet gear or standing water
- Don't unscrew regulator adjusting screw all the way out
- Make sure ground clamp is connected to work
Certification
Troubleshooting
Maintenance
General maintenance
The welding torch and cables should be inspected on a regular basis. Look for any signs of cracking or cuts in the cables.
Specific Maintenance Tasks
Maintenance Procedure | Frequency | Done By |
---|---|---|
Check Argon Pressure | Before Use | Student/Tech |
Check Coolant Flow | Before Use | Student/Tech |
Inspect collet & Cup | Before Use | Student/Tech |