The pins and bushings of Ketjurauma welded chains are fixed to the chain links with press fitting and automated V-braze welding. The shoulders of the pins and bushings ensure high dimensional accuracy and correct lateral gap while increasing the joint strength. Chain links are made from high quality structural steel, to which various attachments or brackets can reliably be welded without pre- or post-heating. Clearance between pins and bushes has been compensated by shortening the outer link pitch, so all chain links will seat onto sprocket correctly.
Assembly and welding are performed by using modern assembly robot cells in one complete cycle. Production phases such as chamfering and immerse lubrication take place immediately before and after the actual chain assembly.
Heat treatment process used for pins and bushes is case hardening, resulting in extremely wear resistant contact surfaces and long product life cycle. Products equipped with stainless joints are an exception – these are hardened by induction hardening.
Instructional quide for correct chain assembly: