Melt tip electroslag welding has been widely used in the welding of steel structures, shipbuilding and the manufacturing of ship engineering and industrial machinery. Melt tip simple electroslag welding is also carried out from bottom to top in vertical position. The welding wire is continuously sent to the molten slag through the welding gun (i.e., the melting nozzle, the steel pipe coated with the agent on the surface). The pipe is installed in the center of the groove and fastened. The surface of the base metal and the welding wire are first melted by the resistance heat in the molten slag, and then combined with the base metal. At the same time, during the welding process, the welding gun is gradually melted and consumed in the slag pool.
The nozzle electroslag welding method has the following characteristics:
(1) It is not necessary to prepare special plate edge processing, and gas cutting can be used for edge cutting. Therefore, the flush I-groove can be welded.
(2) The welding machine has simple structure, convenient operation and transportation.
(3) The deposited metal is rarely defective.
(4) Although there is a little shrinkage after welding, there is little deformation and damage.
Therefore, as a vertical position welding method, simple electroslag welding with melting tip has been applied in many fields.