2

I am just starting out welding. The job is to fillet weld 2"x1" 16 gauge (1.2mm) Rectangular Mild Steel Tubing for fabricating a frame. I have a 250 Amp DC welding machine. Can you suggest Electrode diameter and current? I currently have 8mm electrodes. Would they work fine if I used a low enough amperage setting?

1
  • What welding process? Commented Jun 13, 2020 at 17:16

2 Answers 2

5

In my humble opinion, 8mm rods are way to big for 16 gauge mild steel. You'd need about 250 Amp for that size rod and you'd melt your stock. I wouldn't use a rod any bigger than 1/8". You'd need 50 to 90 Amps for that size rod. A 6013 welding rod should work fine and it's good for ac and dc welders.

Since you're a beginning welder, practice on a few pieces of scrap stock just to get the feel of a smaller rod.

3
  • Heck, 1/16" rods are commonly available. Or perhaps the OP would be looking for 1.5mm rods as the metric equivalent. Swatting a fly with a sledgehammer....
    – Ecnerwal
    Commented Jun 13, 2020 at 14:15
  • So, ideally, should I be using a 1/16" rod? Also, can you guys recommend a reference/table which mentions the recommended electrode sizes for various typical stock sizes. Commented Jun 13, 2020 at 15:48
  • @afterburner77 I can't really recommend a reference table but there are many of them available on the net or where you get your rods from. A 1/16" would be fine too. A lot of this depends on individual technique. I once did a job on an overhead crane and started out with 1/4" rods and finished it with 1/8" ... just took a slower pace.
    – JACK
    Commented Jun 13, 2020 at 16:20
2

I suggest going to MIG, much easier for a new welder ( or a crappy old welder ). Your thin stock would be a challenge for an experienced welder with stick ( SMA ) and any size electrodes and reverse polarity.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.