what is the welding and type of welding

                            #  What is the welding

   #.1 introduction:  Welding is the  fabrication process in which two metal are joint permanently by using of pressure and heat to melt the metal parts together and allowing then to cool , causing fusion .

some welding technique such as soldering and brazing in which do not melt base metal . 

 

   

      #.2  types of welding:

       (a) . Resistance welding  

       (b) . Solid state welding 

       (c) . Gas welding 

       (d) . Arc welding 

       (e) . Soldering and brazing 

 

     # 2. (a):  Types of resistance welding

         (a) .1  Spot welding 

              .2  Seam welding 

              .3  Projection welding 

             .4  Flash welding  

            .5  Upset welding 

  #  (b) : Types of solid state welding 

            .1  Explosion welding 

            .2  Diffusion welding 

           .3  Friction welding 

           .4  Ultrasonic welding 

           .5  Cold welding 

   # (c) : Types of Arc welding 

          .1  MIG welding 

          .2  TIG welding 

          .3  Electric arc welding 

          .4  Shielding arc welding 

     # (d) : Gas welding 

             .1 Oxy acetylene welding 

             .2  Butane  /Propane welding 

             .3  Hydrogen welding 

 # ( e) : Soldering and Brazing welding