alloy 20 tube to tube sheet welding
alloy 20 tube to tube sheet welding
(OP)
Im having cracking problems on the root pass. Im welding 3/4" alloy 20 tubes (.065 wall) to an alloy20 tubesheet (2" thick). We are making a 2 pass strengh weld, saving the tube end. We are maintaining a 250 degree preheat and slow cooling, using ER320 filler on both passes (.045 on the first and 1/16 on the 2nd). we are tig welding using 100% argon. any suggestions would be helpful. Thanks





RE: alloy 20 tube to tube sheet welding
RE: alloy 20 tube to tube sheet welding
RE: alloy 20 tube to tube sheet welding
Start and stops are critical on this material, craters must properly filled; and make sure yor getting enough gas Pre and Post-flow.
Do you see any benefit from using pusle ? why not straight DCEN tig ? Weld heat input must be keep to miniumum, to limit residuals stresses. Also, ACHF is sometimes used for thin material.
RE: alloy 20 tube to tube sheet welding
RE: alloy 20 tube to tube sheet welding