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According to the properties sheets, the tensile strength of ni-rod is close to the cast iron itself. Brazing is a bit (30%) weaker. What caused the failure? Bending? Stretching? Compression?
Dan
At the end of the project, there is a profound difference between spare parts and left over parts.
According to the properties sheets, the tensile strength of ni-rod is close to the cast iron itself. Brazing is a bit (30%) weaker. What caused the failure? Bending? Stretching? Compression?
Dan
It broke in the direction the screw pulls, so it would be a stress fracture in sheer I believe.
Braze is weaker than the cast iron. Arc welding with nickel, or any other metal, leaves a hard, brittle zone behind the weld. The ideal process would be oxy-acetylene welding using cast iron rod and borax flux.
If you decide to braze, remember that CI absorbs oil like crazy. You may be surprised by the amount that sweats out. When silver brazing CI, I always flux and sweat out the oil at least twice before applying the braze. Hope this helps.
Is there anybody else that thinks the irregularity of the crack and crumbling edges looks like it occurred in "punky" metal. In other words, it looks like there may have been a weak spot in the metal itself. If that's the case, braze may be stronger than what was there originally.
No I think you just found the hinge point for the applied stress. I concur brazing would be sufficient. Keith Rucker just did a video where he brazed a good sized chunk of cast iron to an existing member check it out here: https://www.youtube.com/watch?v=KIj5ij84qlU
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