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The other day, For the first time ever, I spent the day welding some food grade tubing. Seems like the root is getting in there good and the outside is pretty much flush, but being as I have never done tubing bfore, I would like some constructive criticism from the experts. Attached Images
Reply:Usually when you buy the tubing it will come capped. I use the caps for my purge. I will tape the caps on, with a hole poked through on one of the caps to bleed the air out. You will need to build up enough back pressure so that your weld will be perfectly flush. You won't get the pressure using steel wool, consistently. Your getting the root.......you just have to play with your purge so that the weld doesn't sink...... Your purge is the key when welding tubing....... Hope this makes sense.Interprovincial RedSeal Welder and SteamfitterMiller Maxstar STL 110vMiller Blue Star DX 185Lincoln 180
Reply:We looked all around the shop for some caps, but or shop is a joke. I was using blue tape. Probably around 15-20 cfh on my purge.If I'm understanding you correctly, I need enough purge to "float" the weld. I'm looking for flush inside and flush outside, no more, no less(?) Using enough purge to keep my root more flat, in turn keeping the cap more flat, less concave.Is that correct? |
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发表于 2021-8-31 22:48:16