welding 9317 and 8620
welding 9317 and 8620
(OP)
does anyone know of a good reference to determine a weld material (TIG) to join these two metals. The 8620 will need to be carburized either before or after the welding (masking of weld area is possible). This is a hollow shaft assembly that will be carrying torque and compressive load at the welded joint





RE: welding 9317 and 8620
RE: welding 9317 and 8620
1) if you weld the parts together before carburizing how does the weld metal respond to the carburizing cycle? Typically the weld metal will be extremely soft after the carburize heat treatment cycle because welds get their strength from a completely different mechananism that heat treated alloy steels.
2)if you weld after carburize how do you deal with the post weld heat treatment of the weld heat affected zone without seriously degrading the hardness of the carburized surfaces.If the carburized area gets above 350 or 400F it will soften but you need temperatures well above this in the weld area to post weld heat treat.
If local PWHT is possible the carburize then weld route may be an option and there are a number of TIG wires available from ESAB and others which will give good properties
If you have to weld before carburize then the choice is more difficult and you will need a weld metal which deposits a chemistry similar to one of your base metals and the choice here is almost none existent unless you make some filler metal from your own base material.
RE: welding 9317 and 8620
http://www.welding-advisers.com/
RE: welding 9317 and 8620
The area of carburization is directly in touch with the weld affected area. An image of the part is below:
The helictical thread is carburized and the internal spline is as well - the blue area denotes the weld.
RE: welding 9317 and 8620
RE: welding 9317 and 8620
RE: welding 9317 and 8620
Could it not be made as a one-piece construction and avoid the welding issue? If the weld is absolutely necessary could the two pieces be fitted together with no gap then seal welded with an autogenous run with no filler metal?
RE: welding 9317 and 8620
RE: welding 9317 and 8620
Gotta love overseas outsourcing huh?
RE: welding 9317 and 8620
RE: welding 9317 and 8620
RE: welding 9317 and 8620
RE: welding 9317 and 8620
RE: welding 9317 and 8620
Regards,
Cory
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