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MAPP gas can be used at much higher pressures than acetylene, sometimes up to 40 or 50 psi in high-volume oxy-fuel cutting torches which can cut up to 12-inch-thick (300 mm) steel. Other welding gases that develop comparable temperatures need special procedures for safe shipping and handling.
Most weld purging is carried out on joints made by the TIG or GTAW arc welding process. [6] When the laser welding process is chosen, joints or welds being made on reactive materials will need to be carried out and in the case of electron beam welding, this is carried out in a vacuum, in which case purging takes place by complete evacuation of all gas.
Oxygen/Propane welding 312: Gas welding with oxygen/propane flame Oxyhydrogen welding: 313: OHW Combustion of hydrogen with oxygen produces flame Limited Pressure gas welding: PGW Gas flames heat surfaces and pressure produces the weld Pipe, railroad rails (limited)
Other arc welding processes use alternative methods of protecting the weld from the atmosphere as well – shielded metal arc welding, for example, uses an electrode covered in a flux that produces carbon dioxide when consumed, a semi-inert gas that is an acceptable shielding gas for welding steel. Improper choice of a welding gas can lead to a ...
A set of MAPP and oxygen cylinders is used for oxy-fuel welding and cutting.. MAPP gas was a trademarked name, belonging to The Linde Group, a division of the former global chemical giant Union Carbide, for a fuel gas based on a stabilized mixture of methylacetylene (propyne), propadiene and propane.
Root pass welding for pipe AWS D10.12: Pipe welding (mild steel) AWS D10.13: Tube brazing (copper) AWS D10.18: Pipe welding (stainless steel) AWS D11.2: Welding (cast iron) AWS D14.1: Industrial mill crane welding AWS D14.3: Earthmoving & agricultural equipment welding AWS D14.4: Machinery joint welding AWS D14.5: Press welding AWS D14.6