CN-122007542-A - Eccentric magnetic control rotary arc welding method

CN122007542ACN 122007542 ACN122007542 ACN 122007542ACN-122007542-A

Abstract

The invention discloses a magnetic control rotation arc welding method, which belongs to the technical field of magnetic control rotation arc welding, and particularly relates to an eccentric magnetic control rotation arc welding method, comprising a magnetic head, wherein a circular tube welding piece is arranged in an inner cavity of the magnetic head, and the method comprises the following steps of S1, eccentrically placing a circular tube center line and a magnetic head center line; based on the method, the original coincident center line of the circular tube part and the center line of the magnetic head are eccentrically placed, so that the generated molten area is eccentric on the end surface of the circular tube, and meanwhile, the magnetic head rotates around the center line of the circular tube, so that the eccentric direction of the molten area can rotate along with the eccentric direction of the molten area, and the penetration of the magnetic arc welding is improved in a way of eccentric and magnetic head rotation under the condition of not changing other welding parameters.

Inventors

LIU XU
LIU HONGBING
GUAN XIANGNAN
ZHANG YOUJIE

Assignees

江苏磁瀚装备有限公司

Dates

Publication Date: 20260512
Application Date: 20260402

Claims (4)

1. The eccentric magnetic control rotary arc welding method comprises a magnetic head, wherein a circular tube welding piece (30) is arranged in an inner cavity of the magnetic head, and the method is characterized by comprising the following specific steps of: s1, eccentric placement is carried out on the center line of the circular tube and the center line of the magnetic head; S2, when the magnetic head rotates around the center line of the circular tube, the eccentric direction of the melting area is continuously adjusted, so that the penetration of the end face of the circular tube is increased.
2. The method of claim 1, wherein the magnetic induction lines of the magnetic field generated by the magnetic head in the end surface area of the circular tube are uniformly distributed along the radial direction by taking the center of the magnetic head as the core.
3. The method of claim 1, wherein the magnetic head rotates around the center line of the circular tube at least one revolution.
4. The eccentric magnetic control rotary arc welding method according to claim 1, wherein the magnetic head is composed of an upper magnetic head (10) and a lower magnetic head (20), and a circular tube welding member (30) is provided between the upper magnetic head (10) and the lower magnetic head (20).

Description

Eccentric magnetic control rotary arc welding method Technical Field The invention relates to the technical field of magnetic control rotation arc welding, in particular to an eccentric magnetic control rotation arc welding method. Background The magnetic control rotary arc welding is a welding method which uses magnetic field force to drive an arc to rotate along the end face of a welding piece at a high speed, uniformly and rapidly heats the welding end face to a molten state, and rapidly applies pressure to upsetting so as to form a firm joint. The current distribution over the tubular element satisfies the distribution shown in fig. 5. The arc is typically positioned outside the end face as it rotates about the welding end face, so that the molten zone is primarily outside the end face of the tube, and the intermediate and inner zones tend to be insufficiently molten, resulting in lack of penetration. This also limits the application of the magnetron rotary arc welding process to butt welding of some thick pipe parts. In the standard magnetic control rotary arc welding process, the welding process is shown in fig. 6 and 7, specifically, as shown in fig. 6, the magnetic head 1 and the circular tube welding piece 2 can be fixed on the equipment, and the center line of the magnetic head and the center line of the circular tube are basically coincident. In general, the magnetic head 1 can generate a uniform magnetic field at the butt end surface gap of the round tube weldment 2. The magnetic field distribution is shown in fig. 7. By combining the current direction and the magnetic induction line direction, the movement path of the arc on the end face of the circular tube can be judged according to the left hand rule of the Lorentz force as shown in figure 8. Fig. 8 shows the rotation direction of the arc, and the arc is rotated at a high speed on the outside of the circular tube in the clockwise direction by the lorentz force. So that the outer region of the end face of the circular tube is fully melted. However, the inner side of the end face causes insufficient melting. Therefore, defects such as insufficient welding fusion are liable to occur. Disclosure of Invention In order to solve the technical problems, the invention provides the following technical scheme: an eccentric magnetic control rotary arc welding method comprises a magnetic head, wherein a circular tube welding piece is arranged in an inner cavity of the magnetic head, and the method comprises the following specific steps of: s1, eccentric placement is carried out on the center line of the circular tube and the center line of the magnetic head; S2, when the magnetic head rotates around the center line of the circular tube, the eccentric direction of the melting area is continuously adjusted, so that the penetration of the end face of the circular tube is increased. As a preferable scheme of the eccentric magnetic control rotary arc welding method, the magnetic induction lines of the magnetic field generated by the magnetic head in the end surface area of the circular tube are uniformly distributed along the radial direction by taking the center of the magnetic head as a core. As a preferable scheme of the eccentric magnetic control rotary arc welding method, the magnetic head rotates around the central line of the circular tube, and the number of rotation turns is at least more than one. As a preferable scheme of the eccentric magnetic control rotary arc welding method, the magnetic head consists of an upper magnetic head and a lower magnetic head, and a circular tube welding piece is arranged between the upper magnetic head and the lower magnetic head. Compared with the prior art: The invention eccentric places the original coincident center line of the round tube part and the center line of the magnetic head, so that the generated melting area is eccentric on the end surface of the round tube, and simultaneously, the magnetic head rotates around the center line of the round tube, so that the eccentric direction of the melting area can also rotate along with the center line of the round tube, thereby improving the penetration of the magnetic arc welding through the eccentric and magnetic head rotating mode under the condition of not changing other welding parameters. Drawings FIG. 1 is a schematic diagram of an eccentric magnetic control rotating arc welding of the present invention; FIG. 2 is a schematic diagram of the magnetic field and Lorentz force direction of the present invention; FIG. 3 is a schematic view of a fusion zone according to the present invention; FIG. 4 is a diagram of the corresponding fused area of a magnetic head according to the present invention when the magnetic head is rotated; FIG. 5 is a schematic diagram of a prior art magnetron rotating arc welding process; FIG. 6 is a schematic diagram of a prior art magnetically controlled rotary arc welding; FIG. 7 is an end view of a prior art magnetically controlled rota