Arc oscillation narrow gap consumable electrode dual-layer gas shield automatic welding gun for robot

Abstract

The invention provides an arc oscillation narrow gap consumable electrode dual-layer gas shield automatic welding gun for a robot. According to an arc oscillation module, a pair of incomplete gears rotating synchronously and oppositely is adopted for being alternately engaged with an oscillation gear to drive the arc oscillation module to oscillated back and forth, a pair of conic gears transmitsoscillation motion to a conducting rod of the welding gun, and a welding arc can oscillate in a narrow gap groove at a high speed according to preset frequency. A welding gun body module is of a flatstructure in a water cooling manner and can stretch into the bottom of the narrow gap welding groove, and inner-layer gas shield, welding wires and electric energy are provided for a high-temperatureweld pool. A lifting type outer gas shade module can be controlled by a robot to automatically adjust the height position according to the groove depth, and outer-layer gas shield is provided for theweld pool and nearby areas. The welding gun has higher arc oscillation frequency, the better gas shield effect and the smaller shape size, and therefore higher welding efficiency and a more stable welding process are achieved, and the welding gun is more suitable for intelligent welding application of the robot.

Description

technical field [0001] The invention relates to welding equipment, in particular to an automatic welding torch with double-layer gas shielding for a robot to swing a narrow-gap melting electrode with an electric arc. In particular, it relates to a robot-used electric arc high-speed swing narrow-gap melting pole double-layer gas shielded automatic welding torch suitable for welding thick plates and medium-thick plates with large dimensions. Background technique [0002] With the rapid development of my country's shipbuilding, nuclear power, pressure vessel and other industries, the application of thick plate welding is becoming more and more extensive. When welding thick plates with traditional welding methods, due to the large groove angle of the thick plates, multi-layer and multi-pass welding is often used for welding, resulting in high heat input, large thermal deformation, and wide heat-affected zone of the welded joints. The mechanical properties are greatly negatively...

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Problems solved by technology

However, this welding torch realizes the reciprocating swing of the arc through the alternating positive and negative rotation of the stepping motor, and the inherent electromagnetic inertia of the stepping motor makes the motor shaft suffer from electromagnetic resistance every time it changes the direction of rotation, thus limiting the power of the motor. The maximum oscillating frequency that can be achieved, when the welding speed is fast, it is easy to appear "S-shaped" weld seam due to insufficient arc oscillating frequency, which affects the quality of the joint

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