A kind of mag horizontal welding welding method and process

A welding method and welding process technology, applied in the field of MAG horizontal welding welding method and process, can solve the problems of welding operation troubles, "mountain"-shaped weld bead, small welding parameters, etc., to avoid large discrete type and simplify process control. The effect of ensuring the uniformity of ingredients

Active Publication Date: 2020-11-27
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reduce the size of the weld bead, and there are often multiple weld beads at the groove position with the same distance from the root. This welding method is prone to produce a "mountain"-shaped weld bead, which will cause troubles for subsequent welding operations and cause problems at sharp corners. unsolved problem
In addition, the welding parameters are small, and the metal impurities in the molten pool are not easy to float out of the weld surface, and it is easy to remain in the weld to form defects; in horizontal multi-layer and multi-pass welding, the next pass is very easy to occur, and the welding site is very easy to Inclusions appear, so there is a high requirement for cleaning between layers; multi-layer and multi-pass welds are arranged, the appearance of the weld after welding is poor, and the operation is extremely difficult; the angle of each welding torch is different, and the operation is extremely difficult

Method used

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  • A kind of mag horizontal welding welding method and process
  • A kind of mag horizontal welding welding method and process
  • A kind of mag horizontal welding welding method and process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as Figure 1 to Figure 3 As shown, in the MAG horizontal welding welding method in this embodiment, the formed weld seam includes a plurality of connected track units, and a plurality of track units are arranged in sequence along the welding operation direction A, and each track unit includes a plurality of head and tail phases Followed welding trajectory. By dividing the welding seam into multiple trajectory units, the control of the process parameters of the trajectory units can be realized to control the welding process, and the industrial control work of the welding operation can be simplified.

[0056] The MAG horizontal welding method introduced in this embodiment includes the first piece and the second piece to be welded, the first piece can be located above the second piece, obliquely above or both at the same level. Both corresponding positions are welding joints, and the method comprises the following steps:

[0057] S1. Determine the relative position ...

Embodiment 2

[0065] The difference between the MAG horizontal welding method in this embodiment and the above embodiment is that each track unit includes four welding tracks. The setting of four welding trajectories can meet the welding requirements of larger weld seam size, larger groove size, and larger welded joint size. The area swept by the four trajectories can basically be approximated as a quadrilateral. Carrying out this "quadrilateral" division of the weld seam ensures that the sweeping conditions of the weld seam are the same in the process of gun transportation, thereby ensuring that the middle part of the weld seam Same as the welding on both sides of the weld, it can also increase the sweeping area of ​​the welding torch on the base metal, thereby increasing the base metal penetration.

[0066] Furthermore, in the MAG horizontal welding method in this embodiment, the included angle between each of the welding tracks and the welding operation direction is an obtuse angle. The...

Embodiment 3

[0069] Such as figure 2 As shown, the difference between the MAG horizontal welding welding method in this embodiment and the above-mentioned embodiment is that: the track unit includes the first track 11, the second track 12, the third track 13 and the fourth track 14 which are sequentially connected end to end. . The welding operation also forms each welding track separately in this order. In each trajectory unit, the trajectory end point 141 of its fourth trajectory is located between the trajectory start point 110 of its first trajectory and the end point of the welding operation (the end point of the weld seam). The trajectory start point of the first trajectory of each trajectory unit (except the first welding unit) coincides / connects with the trajectory end point of the fourth trajectory of the previous welding unit. Repeatedly, a plurality of trajectory units are connected at the end to form a welding seam. Moreover, the design of the technical solution in this emb...

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Abstract

The invention discloses an MAG horizontal welding method and technology. A plurality of track units are continuously distributed at a welded seam between weldments in the positive direction of weldingoperation; and each track unit comprises a plurality of welding tracks, and according to the welding sequence, operation of the first track located at the first station is conducted in the negative direction of welding operation. The invention further discloses the welding technology based on the welding method. Welding operation is conducted by adopting large technological parameters, the welding efficiency is improved, the fusion depth of parent metal at the welded seam is ensured, and in addition, the undercut and weld flash problems are solved to the great extent.

Description

technical field [0001] The invention belongs to the field of welding process control, and in particular relates to a MAG horizontal welding method and process. Background technique [0002] When the horizontal welding welding method in the prior art is implemented, due to the effect of gravity on the molten pool metal, there is a tendency to flow downward, and the phenomenon of undercut is easy to occur above the weld bead, while the weld bead is easy to form below the weld bead. tumor. Therefore, the welding operation has to be performed by limiting the amount of molten metal per pass, reducing the width of the weld bead, and reducing the pendulum of the electrode to reduce the tendency of the molten metal to flow downward. However, for workpieces to be welded with larger dimensions at the welded joints, or workpieces to be welded with larger groove sizes, multi-pass welding has to be used to adopt different weld passes from positions with different distances from the root...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/02
CPCB23K9/02B23K9/173
Inventor 商浩孙正夏齐至亮吕光宙郭文俊王宝昌王一霖贾荣辉徐西振高凯崔传学王康
Owner CRRC QINGDAO SIFANG CO LTD
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