Plastic Welding
In this type, the  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint parts are  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint to  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint. In this stage,  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint is applied to make a  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint. It is also known as  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint.

Fusion Welding
The metal parts are heated upto the  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint. In this type, the  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint is made at this stage and the parts are allowed to  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint. On  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint, the  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint forms a  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint.  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint is applied in this method. Hence, it is also known as  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint or  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint.  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint and  Arc weldingcoolcoolingFusion weldinggas weldingheatedjointmetalmolten metalNo pressureperfect jointplastic statepoint of meltingPressurepressure less weldingpressure weldingsolid joint fall in this category.