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--- elec:welder [2018/05/12 01:55] – created philpem
+++ elec:welder [2018/12/11 08:51] – [Circuit diagram] philpem
@@ Line 7: / Line 7: @@
 I built this thing about ten years ago, so all information here is provided on an as-is basis!
-:!: todo
+{{:elec:welder:welder.jpg?600|}}
+===== Circuit diagram =====
+{{:elec:welder:welder.jpg?direct&600|}}
+===== Bill of materials =====
+  * 5x 120,000uF capacitors
+    * I used these because they were available cheaply from a surplus supplier. A bank of similar screw-mount "computer grade" capacitors should work.
+    * It's possible that a 1-Farad "car audio" capacitor might work, but this will have a lower voltage rating (and thus lower weld power). Aim for 25V or higher.
+  * Copper sheet, K&S #259 (0.025in thick, 4in x 10in sheet)
+    * Used to make the busbars.
+  * IRF 50RIA20 thyristor (SCR)
+    * Weld power switching
+  * High-current cable and crimp connectors
+    * "Car audio" cable should be sufficient. Aim for pure copper, 8AWG or so.
+  * Welding electrodes
+    * You may have to make these yourself. This can be done with a piece of 5mm copper rod -- use a file to shape the tips.
+  * Nickel sheet or strip
+    * This is now commonly available on eBay
+    * If you're in the US, you can buy 0.003in thick nickel shim stock from McMaster-Carr under part number 9707K33.