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How much burn through would be enough to show good penetration / proper one pass heat? Should the backside just start showing signs of heat (ex small flat spots ) or 1/16 size mounds or more?
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- Otto Nobedder
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What process, on what material?Blaze659 wrote:How much burn through would be enough to show good penetration / proper one pass heat? Should the backside just start showing signs of heat (ex small flat spots ) or 1/16 size mounds or more?
It matters. Sanitary sch. 5 stainless will have a minimum of push-through. A sch. 80 2" open root carbon pipe test should have 1/16-1/8" internal reinforcement (a general rule... read the WPS).
This is a question with many different answers depending on the situation.
Steve S
Could you give me some info on Mild Steel and Aluminum Tig welding? Is Mig and Stick the same? I mainly weld tubing and plate. I don't weld anything fancy yet! What a WPS? Yip new guy!
Everlast 250EX
Everlast I-Mig275 w/ Alum Spool Gun
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- Otto Nobedder
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Weldmonger
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Posts:
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Joined:Thu Jan 06, 2011 11:40 pm
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Location:Near New Orleans
Ah, I got it.Blaze659 wrote:Could you give me some info on Mild Steel and Aluminum Tig welding? Is Mig and Stick the same? I mainly weld tubing and plate. I don't weld anything fancy yet! What a WPS? Yip new guy!
WPS= "Weld process specification". Every weld that's been designed by an engineer and qualified by a "competent weldor" will have a WPS that tells you what is and is not allowed. It will define (on stainless pipe, for example) the allowed root gap range, the allowed amount of land, the bevel, the filler material and thickness, and the allowed range of amperage. There can be many other variables for other materials, positions, purposes, what-have-you.
What, exactly, are you trying to weld at the moment? Give us a specific example, and you'll get a better answer.
Steve S
First I really appreciate your help! I was Tig welding aluminum and steel flat bar making diffrent kinds of joints for practice. It looked like I was running good beads. I am just learning. Maybe 5 hours seat time. I welded an aluminum outside corner joint and was very happy with the look. Then I decided to pull the corner weld back against itself with just my hands and it broke the weld right down the middle. 1/8 thick aluminum. I posted pics of the weld and what happened and was told it was a cold weld. There was no deformity or sign on the inside of the corner weld to show good penetration so I figured for good penetration you should see something on the back side of welds to make sure you had good penetration. My steel lap joints showed a varying amount of deformity to the back. Anywhere from flat spots to 1/4 inch mounds. I really don't care for the mounds but I am not sure if just seeing the back start to change is good enough penetration. Hope this makes sense. I don't have pics right now. See "Expertise help needed" post in the TIG section for outside corner pics.
Everlast 250EX
Everlast I-Mig275 w/ Alum Spool Gun
Everlast Plasma60
Everlast 300 Water Cooler
Everlast I-Mig275 w/ Alum Spool Gun
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