Welding Passes Meaning. It is to melt and float out the wagon tracks left after the root pass. The surfacing welds are used when you need to apply welds over the entire surface of a welded piece or a part of it.
The surfacing welds are used when you need to apply welds over the entire surface of a welded piece or a part of it. When the minimum specified preheat temperature is reached when the first crayon mark melts the first welding pass can commence. The result of a pass is a weld bead or layer.
The root pass is the first pass on an open joint usually when welding pipe and mild steel.
A single progression of welding or surfacing along a joint or substrate. Seam welding is a resistance welding process in which suitably contoured copper electrodes apply pressure to create a region of high resistance between metal sheets. A hot pass is a term used in stove-pipe welding when the bead is complete it is given a quick clean up with a grinder then the hot pass follows it burns out the slag that is trapped at the junction between the bead and the pipe wall the slag is often called wagon tracks. Weld Reinforcement Weld metal in excess of the quantity required to fill a joint.