Projection Welding Line. By providing a projection on the surface of one of the workpieces weld current and force can be focused into the small area of the projection to produce heat at the desired weld location. The projections are also often used to accurately line up workpieces.
The advance speed has to be carefully tailored to ensure that the projections correspond with the welding arc timing as they pass between the electrodes. The tail of the welding symbol is used to indicate the welding or cutting processes. Ab80 mm means that Top.
Notations used for Straight Line True length of the line.
Drawings should contain enough information to aid the welder to produce the weldment. Projection Resistance Welding Machines. The top of the projection can be rounded flat or pointed. Denoted by Capital letters.