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.....

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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:

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The cap and back end of transformer windings

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

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Switch with ring of paper insulator

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Switch wiring

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Switch construction

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Switch contacts

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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:

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

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

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Upper and lower arm contacts (front view)

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Lower contact, showing insulation at bottom

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