Submerged Arc Multi-Wire Welding
Submerged arc multi-wire welding is a high-efficiency SAW process with three or more parallel wires to increase speed. It is used in large-diameter pipe and shipbuilding.
Physicochemical Mechanism of Action
Submerged arc multi-wire welding uses several parallel wires fed simultaneously into the weld pool. This increases the energy input and speeds up the melting process. The extra wires cause stronger deformation of the metal mass, resulting in a finer grain structure.
Metallurgical Relevance & Welding Risks
The higher speed can lead to uneven cooling and non-uniform deformation. This can result in stress buildup and cracks in the structure. It's important to control the wire feed speed and the weld pool to ensure a homogeneous weld.
Workshop Practice & Action Instructions
For submerged arc multi-wire welding, use wires with a diameter from 1.2 to 1.6 mm. The speed should be between 30 and 50 m/min. Keep the weld pool stable to ensure even cooling. If you have problems with cracks or stresses, check the wire speed and the weld pool.