Method for improving conductive nozzle of submerged arc automatic welder and welding the conductive nozzle in rotating stand shaft

Abstract

The invention discloses a method for improving a conductive nozzle of a submerged arc automatic welder and welding a rotating stand shaft, which comprises the following steps of: rigidly fixing a rotating stand shaft body (4) through a clamping jaw (5) of a rotary platform (6) before welding, arranging the T-shaped joint end of a rotating stand shaft head (1) into a positioning hole of the rotating stand shaft body, checking the coaxiality of the rotating stand shaft head, the rotating stand shaft body and the rotary platform by using a submerged arc automatic welder head (3) respectively, and performing spot welding and under coat welding sequentially; and clamping a fixed conductive nozzle on the submerged arc automatic welder head (3), connecting the fixed conductive nozzle and a movable conductive nozzle through a variable angle hinge frame and a flexible copper net arranged thereon, regulating the movable conductive nozzle to be aligned with a single U-shaped annular groove of the rotating stand shaft body (4), and performing submerged arc automatic welding after arc initiation, wherein the interlayer temperature of the layered submerged arc automatic welding of each lane is not less than 280 DEG C till the submerged arc automatic welder completes all layered lane welding processes. The submerged arc automatic welding is executed according to the specifications so as to shorten the welding period and improve the quality of seams.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to an improved contact tip of a submerged arc automatic welding machine and a welding method for a turret shaft. Background technique [0002] Figure 1-2 It is a schematic diagram of the structure of the turret shaft, and the turret shaft is made of ZG35CrMo. image 3 It is a schematic diagram of the structure of the turret shaft head, and the turret shaft head is made of 35CrMo. The large end of the turret shaft head is installed at Φ576mm [0003] The turret shaft welded in the positioning hole of the turret shaft body, namely Φ576mm, constitutes the turret shaft used on the planetary gear reducer. The turret shaft after welding is required to be able to transmit a large torque. With its simple structure, lighter weight and lower material cost, the turret shaft is gradually being recognized by many domestic enterprises and widely used. [0004] According to the st...

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Problems solved by technology

[0012] In order to solve the problem that the head of the submerged arc automatic welding machine and the rigid straight cylindrical contact tip may interfere with the welding part of the turret shaft, so that the welding wire cannot reach the welding position of the groove, the invention provides an improved submerged arc automatic welding The contact tip of the machine is used for the welding method of the turret shaft. In this welding method, the rigid straight cylindrical contact tip is changed into a fixed contact tip and a movable contact tip, and the movable contact tip is centered on the On the single U-shaped annular groove of the turret shaft, use other welding characteristics of the submerged arc automatic welding machine to better control the weld quality of the turret shaft, reduce the repair rate of the turret shaft weld and reduce welding deformation In the end, the welding size of the turret shaft is also reduced accordingly, which reduces the welding cost and processing cost

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