The thermal efficiency of oxygen-acetylene gas welding is low, the welding heat input is not concentrated, flux is required when welding aluminum and aluminum alloys, and residues need to be removed after welding, and the joint quality and performance are not high. Because gas welding equipment is simple, does not require a power supply, and is easy and flexible to operate, it is often used to weld aluminum alloy components that do not have high quality requirements, such as thin plates and small parts, as well as repair welding of aluminum alloy components and aluminum castings.
Gas welding joint forms When gas welding aluminum alloys, it is not advisable to use lap joints and T-shaped joints. It is difficult to clean the residual flux and welding slag that flows into the gap. Butt joints should be used as much as possible. In order to ensure that the weldment is penetrated without collapsing or burning through during welding, a grooved backing plate can be used. The backing plate is generally made of stainless steel or pure copper. Welding with a backing plate can obtain good reverse formation and improve welding productivity. .
