In gas welding, a flame supplies necessary heat for fusing the base metals. Similarly, in arc welding, an electric arc supplies necessary heat. While joining two components by either gas welding or arc welding, the flame or arc can be moved towards the direction of weld progression or opposite to the direction of weld progression. Based on the relative position of the weld bead (puddle) and flame/arc, welding technique can

Oxy-fuel gas welding is one fusion welding process where components are permanently joined together. Here heat is supplied by burning a suitable gaseous carbonaceous fuel with oxygen. Potential fuel oxy-fuel gas welding incudes acetylene, propylene, propane, MAPP (methylacetylene-propadiene propane) gas, and natural gas; however, acetylene (C2H2) is frequently used as it offers maximum flame temperature. Both the fuel and oxygen are stored separately in cylinders, and these are mixed in