Ultrahigh speed double-wire common molten pool gas metal arc welding process for low carbon steel thin plate welding

A welding technology of molten electrode gas and thin plate, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve strong adaptability, reduce welding production costs, improve the flow process of liquid metal and the effect of heat distribution

Active Publication Date: 2018-09-28
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, the existing MIG welding process still cannot meet the requirements of my country's welding manufacturing industry for greatly improving welding production efficiency and reducing costs; quality welding process

Method used

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  • Ultrahigh speed double-wire common molten pool gas metal arc welding process for low carbon steel thin plate welding
  • Ultrahigh speed double-wire common molten pool gas metal arc welding process for low carbon steel thin plate welding
  • Ultrahigh speed double-wire common molten pool gas metal arc welding process for low carbon steel thin plate welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown, an ultra-high-speed twin-wire eutectic pool gas shielded welding process for welding low-carbon steel sheets includes the following steps:

[0043] (1) Pretreatment before welding: 2mm thick Q235 is used as the welding workpiece. The workpiece does not need to be grooved, and the butt edge is kept perpendicular to the surface of the workpiece; the area to be welded is ground and derusted, and the grinding width is not less than 20mm;

[0044] (2) Workpiece clamping: Clamp the two workpieces processed in step (1) on a worktable that can move the workpiece at a constant speed at any speed between 0.5 and 4.0m / min, without using a liner; The gap between workpieces is 0.8mm; with ordinary CO 2 Gas shielded welding for tack welding;

[0045] (3) Welding: fix the front welding torch and the rear welding torch on the upper part of the workpiece to be welded in step (2) along the welding direction, the vertical distance between the nozzle of the we...

Embodiment 2

[0060] With 2mm thick Q235 as the welding workpiece, adopt the same welding process and parameters as in Example 1 to test the flow situation of the molten pool in the workpiece welding process, the results are as follows Figure 5 It can be seen that a shallow depression is formed in the molten pool below the front wire arc, and the liquid metal flows backward, but under the forward blowing force of the rear wire arc, the backward flow velocity of the liquid metal decreases , the accumulation of liquid metal between the two welding wires has increased but no obvious liquid local bulge has been formed, while the liquid metal in the tail area of ​​the molten pool is evenly distributed and has good fluidity, without significant depressions, thin liquid layers, and liquid metal in the front of the molten pool. The appearance of a bulge. This is because the rear wire arc with a smaller current exerts a certain hindering effect on the high-speed backward liquid flow at the front of...

Embodiment 3

[0064] An ultra-high-speed twin-wire eutectic pool gas shielded welding process for welding low-carbon steel sheets, comprising the following steps:

[0065] (1) Pretreatment before welding: 1.5mm thick Q235 is used as the welding workpiece. The workpiece does not need to be grooved, and the butt edge is kept perpendicular to the surface of the workpiece; the area of ​​the workpiece to be welded is ground and derusted, and the grinding width is not less than 20mm.

[0066] (2) Workpiece clamping: Clamp the two workpieces processed in step (1) on a worktable that can move at a constant speed at any speed between 0.5 and 4.0m / min, and the gap between the workpieces is 0.5mm; no need to use liner; use ordinary CO 2 Gas shielded welding for tack welding;

[0067] (3) Welding: fix the front welding torch and the rear welding torch on the upper part of the workpiece to be welded in step (2) along the welding direction, the vertical distance between the nozzle of the welding torch ...

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Abstract

The invention relates to an ultrahigh speed double-wire common molten pool gas metal arc welding process for low carbon steel thin plate welding and belongs to the field of gas metal arc welding. Theprocess comprises the following steps: 1) grinding a to-be-welded region of a workpeice to dedust; 2) clamping two workpieces processed in the step 1) on a worktable capable of moving at a constant speed, wherein no slopes are needed in the workpieces; and 3) fixing a front welding gun and a back welding gun in tandem along the welding direction to the upper part of the to-be-welded region of theworkpeice in the step 2) for ultrahigh speed panel butt welding. The flowing process of molten metal in the molten pool and the heat distribution in the high speed welding process are improved and thefilling process of the molten metal to a weld bead is accelerated by regulating a front wire large current molten pool by means of a relatively small back wire pulse current, so that the defects of undercuts and humps easily generated by single wire welding can be prevented effectively; ultrahigh speed and high quality welding of low carbon steel of the thin plate is achieved at a welding speed reaching 3.4 m / min, the welding speed and the production efficiency are improved effectively, and the welding production cost is lowered obviously.

Description

technical field [0001] The invention belongs to the field of gas shielded metal welding, and in particular relates to an ultra-high-speed twin-wire eutectic pool gas shielded metal welding process for welding low-carbon steel sheets. Background technique [0002] GMAW (Gas Metal Arc Welding), has been widely used in pressure vessel manufacturing, shipbuilding, and steel structures due to its high welding productivity, good mechanical properties of joints, easy automation, and low welding costs. Manufacturing and other fields. However, with the continuous development and progress of the modern industrial system, especially the concept of Industry 4.0, the requirements for welding productivity are getting higher and higher, and the traditional monofilament GMAW is increasingly unable to meet the modern industrial system in terms of welding speed and deposition rate. requirements. The main reason is that when the welding speed is further increased to improve the welding produ...

Claims

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Application Information

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IPC IPC(8): B23K9/173B23K9/235
CPCB23K9/173B23K9/235
Inventor 陈茂爱王晓涛
Owner SHANDONG UNIV
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