The thickness of the laser welding machine depends on the power of the laser generator inside the Laser Welding Machine, the thickness of the object to be welded. These two points are the most important.
proposenately
4MM..
For welding 8 mm thickness metals, common methods include MIG (Metal Inert Gas) welding, TIG (Tungsten Inert Gas) welding, and stick welding (SMAW - Shielded Metal Arc Welding). The choice depends on the type of metal and specific requirements.
See preceding question re: Mig welding.
The minimum thickness for SMAW welding is about 18 ga. with a steady hand.
AWS D1.1 is the American Welding Society structural welding code for carbon steel of 1/8 inch or greater thickness.
A number of factors go into this: base material thickness, joining material thickness, wire thickness, shielding gas composition, angle of weld, etc. The best way to determine this is to measure your material, then open your MIG welder, find the wire size of the spool, and read the chart inside of the MIG Welder door.
The STRA test is a test of the thickness ductility of a steel plate (the Z direction).
pipeline welding You could find them from many welding institutes round the world. check the websites.
Check first with your community college as they very often have contact with companies that are looking for graduates of a welding class. Check local phones books of companies that do welding and stop in and ask if they are hiring
Gas o vapor