Minimum Chamfer and/or Radius Edge Requirement For Brazing Steel Parts

[TorsionalStress]

I’m currently working on a design that requires the brazing of a steel insert into a groove of a mating steel part.

I would like to know if there is a rule of thumb or table that will provide the minimum edge chamfer and/or radius size on the steel insert for the best capillary attraction between parts?

Any response will be greatly appreciated!

 

[flash3780]

I'm not aware of any specific requirement, but you might check the AWS Brazing Handbook to be sure.

http://engineers.ihs.com/document/abstract/LJFEKAAAAAAAAAAA

or

http://www.scribd.com/doc/37995824/Brazing-Handbook-AWS

 

[TorsionalStress]

I’m actually modifying a previous design which has a gap of 0.015” between the insert & mating part. After doing some research, I think this gap might be too large? Can anyone confirm?

Any response will be greatly appreciated!

 

[flash3780]

Pretty sure that 15 mil is considered wide open in the brazing world. I've dealt with brazing nickel parts, and they require a 2-5 mil braze gap. Check the AWS Brazing Handbook - they have recommended gaps for different alloys.

 

[TorsionalStress]

This is why I asked, I also read (0.002 - 0.005”). The current insert is 0.375” fitting in a groove of 0.406”. I also think the fit dimensions have to be tighter?