dbooker630
Materials
- Apr 16, 2004
- 525
At my facility we have a single-end flash buttwelder used for joining cold drawn tube stock to forged ends. The 6.375" diameter tube has a wall thickness of .690" and the forged end is partially bored to produce a corresponding mating wall.
My question deals with the formulas used to calculate how much burnoff is required to achieve plasticity and proper upsetting. It seems whenever I ask the senior metallurgists I know about this they come up with something out of their head and the process is set. Certainly there is some trial and error involved and based on history I probably could figure out where to start if running a new job but I am looking for less art and more science.
I looked at MIL-W-6873(C) which showed some charts comparing flashing time to wall thickness, voltage vs. area, total material loss vs. wall thickness, and total upset vs. wall thickness. What I am unsure about is if the data is for a specific job, meaning I must develop my own chart, or can the curve plots be applied similarly to other jobs. I'm trying to take some of the guesswork out the development stage-thanks!
My question deals with the formulas used to calculate how much burnoff is required to achieve plasticity and proper upsetting. It seems whenever I ask the senior metallurgists I know about this they come up with something out of their head and the process is set. Certainly there is some trial and error involved and based on history I probably could figure out where to start if running a new job but I am looking for less art and more science.
I looked at MIL-W-6873(C) which showed some charts comparing flashing time to wall thickness, voltage vs. area, total material loss vs. wall thickness, and total upset vs. wall thickness. What I am unsure about is if the data is for a specific job, meaning I must develop my own chart, or can the curve plots be applied similarly to other jobs. I'm trying to take some of the guesswork out the development stage-thanks!
