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Tractorholic
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Practice, and understanding of your welding environment will greatly help with "arc blow" . Is it magnetic or thermal? And can it be used to your advantage for better penetration ??
Isolate your test piece with something non-magnetic , like brass clamps can help.
If i need to weld srtuctual steel I try to use ac if possible, especially on heavy stuff (3/4" or more ).
Dc at high amperes can get pretty tough to control and your beads get all wavey and to fluid like.

1/8 7018 Lincoln ex caliber rod at 75-100 amps ( depends on machine ) i like to keep my arc short and controlable , if you let it get too long then you can see the molten puddle start " dancing" not good and thats when the game is on! You have to really work to get it under control.
Make sure your comfortable !!!! If you are figiting and wiggling to get comfy your weld will not forgive you.
 
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PK Fanatic
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5,251 Posts
Done! When you take the test, you get two plates; that way you can have the second if you mess up the first.

Halfway up the root pass on my first plate somebody hit their head on the emergency shut off switch! It was not very good anyway, so I did not care and I went to the second plate.

The root pass on my second plate was great! I had arc blow at the very end, but the ends are normally thrown away anyway because of the crater when you stop. The teacher said it was just about te best root pass he has ever seen! Other then the arc blow of course.

It took me 3 hours to make all of the welds, and another 25 minutes to grind it. I think I did pretty well, but I am not confident that I passed. While I ground down the face, I did not see any porosity or slag inclusions... So that is a very good sign.

Results will be in after 3-4 weeks.

I took pictures, I will post them soon.
 

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PK Fanatic
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5,251 Posts
Discussion Starter · #24 ·
Here are those pictures I promised.

These are the two plates I made up for the test.

39C6CBEF-D642-463D-BD71-0E1A2435F300-394


This was the root pass of my second plate.

F09DFE24-572F-4D9B-A134-A5545ACD3A45-399


Here is the grove 90% filled. Sorry, pretty blurry.

C868862E-09BE-4E0E-A93A-F0BADFB77A80-394


I was in a rush to finish on time, and I did not have a chance to take a picture of my cover passes.
 
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