Method for welding pipes

The methods of welding pipelines are usually gas welding, automatic arc welding and contact welding, and which welding method to choose mainly depends on the material and angle of the pipeline. The welding angle of welded pipes should be determined on site according to the actual situation, including vertical welding, overhead welding, flat welding and other angles. If it can be moved, it can be rotated to use flat welding.

Gas welding (OFW) uses the flame produced by the mixed combustion of combustible gas and combustion-supporting gas as the heat source to melt the weldment and welding material, and realize atomic bonding. The combustion-supporting gas is mainly oxygen, and the combustible gas is mainly acetylene and liquefied petroleum gas.

The welding materials used mainly include combustible gas, combustion-supporting gas, welding wire and gas welding flux. Its characteristics are simple equipment and no electricity; Arc welding takes electric arc as heat source, and uses the physical phenomenon of air discharge to convert electric energy into heat energy and mechanical energy needed for welding, thus achieving the purpose of connecting metals.

The main methods are covered electrode arc welding, submerged arc welding and gas shielded welding. Covered electrode arc welding is the most widely used welding method in industrial production.