Weld penetration testing
Tue, 31 Aug 2021 09:34:19 GMT
I've been practicing my MIG welding on different gauges of mild steel and was wondering what others here use when checking for penetration depths. I tried cutting the weld then brushing on battery acid. It somewhat worked. I don't need a gallon of acid for a small patch tests and searching around I don't see any small bottles of etching/testing liquid.Any suggestions?My battery acid test. Attached Images
Reply:First you have to polish the surface so all the saw marks are gone. The smoother the surface the better the result.Then use naval jelly or other rust remover based on phosphoric acid. A bit safer to handle then battery acid.Fronius Transpocket 180Kemppi minarc 150Esab powercut 400
Reply:This is what I use. Attached ImagesDont pay any attention to meIm just a hobbyist!CarlDynasty 300V350-Pro w/pulseSG Spool gun1937 IdealArc-300PowerArc 200ST3 SA-200sVantage 400
Reply:Thanks! I do have several flap wheels and I'll look for the other products. For rust removal of small items I've been soaking them in vinegar which works well.
Reply:Originally Posted by Flyer58I've been practicing my MIG welding on different gauges of mild steel and was wondering what others here use when checking for penetration depths. I tried cutting the weld then brushing on battery acid. It somewhat worked. I don't need a gallon of acid for a small patch tests and searching around I don't see any small bottles of etching/testing liquid.Any suggestions?My battery acid test.
Reply:Originally Posted by CEPThis is what I use.
Reply:Originally Posted by OscarPlease post a direct link so that anyone can order that bottle of phosphoric acid. That would be great.
Reply:Amazon also has it, but it's 1 gallon jugs, several strengths, I think the 85% was about 38 bucks with free shipping.IMPEACH BIDEN!NRA LIFE MEMBERUNITWELD 175 AMP 3 IN1 DCMIDSTATES 300 AMP AC MACHINEGOD HELP AMERICA!Freedom is never more than one generation away from extinction.We didnt pass it to our children in the bloodstream".RONALD REAGAN
Reply:Originally Posted by CEPHere you go. http://www.ebay.com/itm/NC-8682-Phos...UAAOSwj3xbM~j3
Reply:Keep in mind it is also called muriatic acid. Tile cleaning, metal prep., quite a number of uses. Jasco used to make a line of products.The above has been shown to be false/incorrect information. Please ignore the above statement.Last edited by Sandy; 01-19-2020 at 07:02 PM.Reason: Prevent the spread of bad info."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:Originally Posted by SandyKeep in mind it is also called muriatic acid. Tile cleaning, metal prep., quite a number of uses. Jasco used to make a line of products.
Reply:Originally Posted by OscarMuriatic acid is not the same, as it is hydrochloric acid, not phosphoric. It [muriatic] will also etch, it's just worse to deal with compared to the other alternatives.
Reply:Thanks again for the updates and help. I'll try these suggestions.
Reply:Originally Posted by 123weld , that remeinds me of having to test for a rebar cert in the field. the inspector was hinting around for me to go up the hill, and figure out a way to get battery acid out of my trucks battery. i think we ended using his dye pen sprays. yep, polish it up like there telling you
Reply:If you're struggling with getting a decent etch, then try pre-heating the metal with a blowtorch. Not proper hot, just 100 degrees C or thereabouts.I do this, and use stainles steel passivating acid (weak nitric, I THINK, possibly combo with phosphoric). works a treat.
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