... , welding, punched slot open 2. precise, affordable, convenient 1. gouging torch have root and on the back of the weld slotted ... recycled asphalt concrete pavement every defect,2.remove more than high weld, open welding grooves, in no plasma cutting equipment ... stainless steel and copper materials,3.carbon arc gouging gun carbon rods rated current accord with (GB12174-90) standard. hot gouging torch