Explanation

A arc welding method using combustion arc under welding flux layer as heat source for weld. The arc generated between the weld electrode and the workpiece not only makes the electrode and the workpiece melt to form a molten pool, but also makes the welding flux around it melt to liquid slag. Covered with arc and molten metal. In addition to protecting and purifying the molten pool, it can also stabilize the arc and infiltrate alloy elements, thus improving the weld performance. Because it is allowed to use large current density? The heat is concentrated in a very small welding area. Therefore, the welding speed is fast, the penetration is large, and smaller groove and less filler materials can be used. Save materials and electric energy, suitable for weld of medium and thick plates. The welding seam is smooth, without arc flash, splashing, and less smoke and dust, and the working conditions are significantly improved. It has high requirements for joint processing and assembly, and is suitable for flat and long welds. There are automatic submerged arc welding and semi-automatic submerged arc welding. Weld equipment is supplied by power supply, control box, welding wire feeding mechanism and welding machine; Traveling mechanism and welding flux conveyor. Generally, a steep drop external characteristic power supply is used, while a DC flat characteristic power supply is used for thin wire (with a diameter of less than 2.4mm) welding of thin plates. There are two types of feeding methods: constant speed feeding and variable speed feeding. welding flux can be divided into melting welding flux and sintering welding flux. Electrodes include single wire, multi wire flux cored welding rot and strip electrode. submerged arc welding is a weld method suitable for mass production. It is widely used for weld of non-alloy steel, low alloy steel, stainless steel, heat resistant steel and some non-ferrous metals (such as nickel base alloy, titanium base alloy, gold and copper base alloy), as well as surface overlaying.

Classification