It's best to keep it simple when it comes to work instructions for the machines (press brakes, punch press, etc.) Break it down into less then 10 steps plus some notes geared towards safety, PM, and quality. For the notes, ask the supervisor if anyone has ever broken a machine or injured...
Part-numbers are typically in the tooling. An old-fashion label-maker can be used to put serial numbers on the wax-pattern. The plastic will be burned out in the pre-heat oven. Since the foundry might not know the heat number when the mold is made, the heat number is usually stamped. All...
Thanks metengr. Yes, it is a matching filler metal, but if the part doesn't get solution heat-treated after weld, what happens to the Cu in the weld metal? Is most of it dissolved anyway? Otherwise, when it goes to age, no precipitation hardening takes place in the weld metal.. right?
2nd...
One more thing....
For 1st question, I'm sure more information is needed to give a precise answer. Please assume cooling-rate resulting from TIG weld-repair of .250 section casting, with copper-backing plate, and try to get me in the ball-park. Thanks.
If a specification allows for welding after solution and before age, can anyone tell me what the microstructure of the weld-metal looks like (more or less)?
Also, one spec allows welding in the aged condition, and re-aging the part. But it limits this practice to 2 times. Does solution reset...
Reduction or elimination of ferrite makes it easier to roll 304L into sheet, bar, etc. If you are making CF3 castings, you don’t have this restriction so you adjust your Ni / Cr ratio for a little ferrite for all the reasons mentioned above.
For reference, yield strength of CF8M is...
sometimes the acid-bath can turn on you and start eating up your metal with martensitic stainless, esp. if you occasionally produce some nefarious microstructures, Cr-depleted areas; or if vendor process control is weak.
I suspect redpicker is correct. Nitrogen back-flush in vacuum furnace sound more like it. Never a problem for me w/ thin section investment castings, but most of my 304 was 304L anyway, so the solution anneal was just a formality.
