Liquid Metal
Member
- Messages
- 482
- Location
- Essex, UK
Right, to set the scene, was haing a bit of a discussion today with some other guys at work, regarding stop/starts when using LowHy rods, either 7016 or 7018.
Now the way I have always done this, is to run out a rod, stop. Then take a grinder with a 2.5mm disk, and backgrind the crater plus a teeny bit more to get rid of any porosity in the stop. Then when starting the next rod, start 1/2 inch or so on top of the last run, then down into the crater ive just ground out and along the seam bit like ____==_____ (if that makes sense) then when end of that rod, repeat the grind out of the crater, plus grind the start off, so the weld resembles a continuous weld. This has passed Xrays/ultrasound tests on plate and pipe.
One or two of other guys, say the only way to do it properly is to yes, grind out the crater, but then start the next rod 3/4inch or so in front of crater, then long arc it back before running along the weld.
Just curious as to what method other people use and what has had better NDT success???
Now the way I have always done this, is to run out a rod, stop. Then take a grinder with a 2.5mm disk, and backgrind the crater plus a teeny bit more to get rid of any porosity in the stop. Then when starting the next rod, start 1/2 inch or so on top of the last run, then down into the crater ive just ground out and along the seam bit like ____==_____ (if that makes sense) then when end of that rod, repeat the grind out of the crater, plus grind the start off, so the weld resembles a continuous weld. This has passed Xrays/ultrasound tests on plate and pipe.
One or two of other guys, say the only way to do it properly is to yes, grind out the crater, but then start the next rod 3/4inch or so in front of crater, then long arc it back before running along the weld.
Just curious as to what method other people use and what has had better NDT success???