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IGBTs and sparkgaps in homebrew TIG welder

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LAN_403

klugesmith

Mon Mar 22 2010, 08:47PM

Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716

Here's a project on a welders' forum that strikes some chords with topics popular here.

These guys have been refining a fancy homebrew TIG welder.
A block diagram appears under Complete System Drawing.

For sustained 100+ amperes at moderate voltage and frequency,
they start with a basic current-limiting stick welder (buzz box).
Its output is rectified, filtered, then switched with IGBT bridges.
See 100- and 200-A power stage drawings.

As a high-frequency arc starter, they are using a variant on SGTC.
A little NST drives a resonant sparkgap-capacitor-inductor loop.
The coupled secondary winding is a few turns of the main welding cable.
See Arc Starter drawing.

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