Alternating Ultrasonic Field Assisted Narrow Gap Welding Method

Abstract

The invention discloses a narrow-gap welding method assisted by alternating ultrasonic fields, which includes 1) placing a processed workpiece on a welding platform, making a groove on the workpiece to be welded, pressing the four corners tightly, and placing the workpiece on both sides above the groove respectively. An ultrasonic device, the lower ends of the ultrasonic generators point to the opposite side of the groove, and the electrodes are arranged in the middle of the two ultrasonic devices; 2) welding, the left and right ultrasonic devices work alternately to make the arc swing left and right; 3) during the welding process, adjust the ultrasonic device Power and frequency parameters, change the arc deflection range, so that the arc parameters are reasonably matched with the ultrasonic parameters. 4) After the welding is completed, turn off the system, cool it to room temperature in air, wipe it clean, and complete the welding. The invention ensures that the ultrasonic field can effectively control the deflection of the arc, compress the arc, enhance the energy of the arc, and effectively solve the key problem of the refractory side wall of the narrow gap.

Description

technical field [0001] The invention relates to a metal narrow gap welding method, in particular to an alternating ultrasonic field assisted narrow gap welding method. Background technique [0002] With the increasing application of thick plates in metal components such as deep-sea engineering, ships, thick-walled pipelines, and pressure vessels, higher requirements are placed on the welding efficiency and quality of thick plates. The traditional welding method requires a large-angle V-groove, which will cause problems such as large welding filling, large joint deformation and low welding efficiency. Narrow gap welding technology has the advantages of high welding efficiency, less welding material consumption and low heat input due to the use of narrow and deep small-angle U-shaped or I-shaped grooves, and the advantages of narrow gap welding become more and more obvious. [0003] Although narrow-gap welding has many advantages, due to the small-angle groove used in narrow...

AI Technical Summary

Problems solved by technology

The disadvantage is: the vibration frequency of the welding wire is low, and the beneficial effect of ultrasonic vibration on welding cannot be brought into play

The disadvantages of this technology are: the coupling of ultrasonic frequency electrical signals can cause additional heat input, which will cause grain coarsening; at the same time, the ultrasonic vibration energy of the molten pool is relatively low

The disadvantage of this technology is that the ultrasound mainly acts on the weld pool, and no effective solution is proposed for the side wall refractory problem of narrow gap welding

However, this patent uses a low-frequency sound field to make the tungsten electrode mechanically oscillate. The sound field acts on the connecting rod instead of directly acting on the arc. The sound field and the arc are not coupled, and there is no obvious difference from the traditional mechanical oscillating arc in essence.

[0009] Alternating ultrasonic field-assisted narrow gap welding technology can not only make the arc reciprocate to the side wall, but also compress the arc and increase the energy density of the arc through the coupling effect of ultrasound and arc, thereby improving the penetration depth of the side wall. The research at home and abroad is still blank. , to ensure that the ultrasonic field can effectively control the deflection of the arc to both side walls, compress the arc, increase the energy density of the arc to improve the penetration depth of the side wall, and use this method to effectively solve the key problem of narrow gap side wall refractory

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