Scrap pieces of all types, shapes, and thicknesses are useful for the training of beginners in various
welding methods. This includes polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC),
plasticized tank linings, and other thermoplastics.
The basic took for all three types of hand welding are: the welding gun (often called welding torch or
simply welder), metal tips, pliers, and cutting knife. Air pressure, a combustible gas and/or electricity are
used to provide the hot air stream; i.e., water-pumped nitrogen or another inert gas is used instead of air
for polyethylene and, in some cases, for polypropylene.