A Study on the "Stellite" Hard-Facing

Specifically on the snake and shaft of "Kinion-pump"

Abstract

In current practice "Kinion-pump" snakes and shafts are surfaced with hard-facing filler metal in order to avoid thier abrasion and heat-softening. A most famous grade of hard-facing filler metal is called "Stellite" containing 40-50% Cobalt, 20-30% Chromium, 0.2-0.8% Tungsten and others.
There are many difficulties, however, in the execution of this treatment, i. e, cracking of filler metal, distortion of shaft and so on.
To get rid of these troubles, the writers conducted some experiments and good results have been obtained through the following countermeasures taken:
1) Provide a perfect preheating of the base metal.
2) Avoid overheating of the base metal and over cooling after welding.
2) Select the right kind of filler metal for the base metal.
4) Prevent impurities from entering into deposit metal, as a result of unstable gas flame used.
5) Adopt the proper method of welding operation and procedure.