Weld Mold 888 description: Weld Mold 888 is for joining both heat treatable and non-heat treatable steels. Subsequent heat treatment procedure of cracked and fractured tools, dies, fixtures, and other parts will be dependent on the base material. The low coefficient of friction of 888 makes it ideal for buildup and surfacing on shafts, bearing surfaces, and valves. Ideally suited for high temperature applications such as steam turbine buckets, blades and covers.