Welding is basically a permanent joining process. It was defined as “ A process of permanently joining two metals together with the application of heat”.Presently polymers can also be welded with different techniques, therefore it can be said as a joining process of two materials together with the application of heat.
Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing fusion, which is distinct from lower temperature metal-joining techniques such as brazing and soldering, which do not melt the base metal. In addition to melting the base metal, a filler material is typically added to the joint to form a pool of molten material (the weld pool) that cools to form a joint that is usually stronger than the base material.Pressure may also be used in conjunction with heat, or by itself, to produce a weld.
The process of welding can be classified on the basis of heat generation, barring the process of welding which does not use heat for joining as pressure only is sufficient for the exchange of surface molecules to make the joint.
Stick welding is pretty simple and the stick welding machine is simple too and also pretty cheap. You can buy a Lincoln 225 AC welding machine at any Home Depot for way less than 300 dollars.