MadModder

The Shop => Tools => Topic started by: vtsteam on June 12, 2025, 02:31:21 PM

Title: What's inside of a Harbor Freight 220V Spot Welder?
Post by: vtsteam on June 12, 2025, 02:31:21 PM

What's inside a Harbor Freight 240 volt spot welder? Well the switch on mine was starting to act flakey, so I decided to find out.....

   [attachment id=0 msg=165891]

End cap left, fixed handle lying on top of main body with switch wires and switch, moveable handle above that. Handle pin partly removed at front.

Title: Re: What's inside of a Harbor Freight 220V Spot Welder?
Post by: vtsteam on June 12, 2025, 02:51:46 PM

End cap removed:

 [attachment id=6 msg=165892]

The cap and back end of transformer windings

 [attachment id=0 msg=165892]

The fixed handle and trigger wire running down channel to the switch:

 [attachment id=5 msg=165892]

Switch with ring of paper insulator

 [attachment id=4 msg=165892] 

Switch wiring

 [attachment id=2 msg=165892]

Switch construction

 [attachment id=1 msg=165892]

Switch contacts

 [attachment id=3 msg=165892]

Title: Re: What's inside of a Harbor Freight 220V Spot Welder?
Post by: vtsteam on June 12, 2025, 03:05:35 PM

The front arms. Upper moveable arm removed. Sits in cast aluminum retainer, attaches to brass contact shell:

 [attachment id=1 msg=165893]

The handle pivot showing straight knurl for "press" fit (doesn't work well)

 [attachment id=0 msg=165893]

Upper arm contact (brass right) lower arm contact (copper center) and pivot

 [attachment id=2 msg=165893]

Upper and lower arm contacts (front view)

 [attachment id=3 msg=165893]


 [attachment id=4 msg=165893]

Lower contact, showing insulation at bottom

 [attachment id=5 msg=165893]