 Another common process , explosion welding , involves the joining of materials by pushing them together under extremely high pressure . The energy from the impact plasticizes the materials , forming a weld , even though only a limited amount of heat is generated . The process is commonly used for welding dissimilar materials , such as the welding of aluminum with steel in ship hulls or compound plates . Other solid @-@ state welding processes include friction welding ( including friction stir welding ) , magnetic pulse welding , co @-@ extrusion welding , cold welding , diffusion bonding , exothermic welding , high frequency welding , hot pressure welding , induction welding , and roll welding . 
