OBJECTIVETo measure the microstructure of laser-welded cast pure titanium by different gap distance.

METHODSForty specimens were sectioned and welded at four gaps (0.00 mm, 0.25 mm, 0.50 mm and 1.00 mm). Took microhardness test and metallographic examination of welded zone surface.

RESULTSThere were no difference in microhardness value and metallographic observation between welded specimens. The width of heat-effected zone was different. The smaller grains and needle-like alphamartensitic structure were found in the heat-affected zone.

CONCLUSIONThe effects of the joint gap were not significant.