Phone: (781) 321-9625
Compressor Crankshaft Welding Service
Hillside Machine Inc. offers a complete compressor crankshaft welding and grinding service.To properly prepare a crankshaft journal for a weld, the journal must be ground down first. Many severely damaged crankshafts with a bad journal are significantly out of round and may still contain embedded bearing material. Pre-grinding the crankshaft can eliminate these obstacles to a superior weld. After the weld is completed, the crankshaft is then straightened using a "stress relief" process while the crankshaft is still hot. After cooling and straightening, the crankshaft is then placed into the crankshaft grinding machine. For rod journal welds, the nearest good journal is used to index over to the welded journal. This assures that the crankshaft remains within spec. Then, the crankshaft is ground down to .020 oversize and re-checked for straightness. After this, the grinding wheel is dressed and is used to grind the crankshaft as normal.

Compressor Crankshaft during the welding process.
Sugmerged Arc Welding process

The Crankshaft welding machine is setup similar to a crankshaft grinder. The chucks are offset for the crank stroke, and counter weights are utilized to balance the crankshaft as it rotates. The most popular crankshaft welding process is the submerged arc welding method . The Submerged  Arc welding process utilizes a gravity fed flux to completely cover the welding wire at the  (arc point), this keeps out oxygen and allows for a superior weld.