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Method for overlap welding of steel bars

A technology of lap welding and steel bars, which is applied in the field of steel bar lap welding, can solve problems affecting welding quality, etc., and achieve the effects of preventing welding porosity defects, increasing welding speed, and reducing manpower hours

Active Publication Date: 2014-01-08
STATE GRID CORP OF CHINA +1
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  • Claims
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Problems solved by technology

Because in the actual construction process, there are rust and other dirt on the surface of the steel bar during welding, so defects such as pores and slag inclusions inevitably exist after the steel bar is welded, which affects the welding quality

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  • Method for overlap welding of steel bars
  • Method for overlap welding of steel bars
  • Method for overlap welding of steel bars

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Embodiment Construction

[0025] control Figure 1-4 The operation steps of the present invention are further described:

[0026] A drug core CO 2 The method for lap welding of steel bars with gas shielded welding wire is characterized in that: the welding equipment uses an inverter CO 2 Gas shielded welding machine, using ER501T-1 CO 2 Flux cored gas shielded welding wire, the steel bar is HRB335 with Φ20mm-30mm steel bar;

[0027] The welding method is as follows:

[0028] 1) Lap the steel bars and spot weld them;

[0029] 2) Root-layer welding of steel bar lap welds: the arc moves in a straight line 4, welding parameters: welding current is 260A, welding voltage is 23V, welding speed is 35-40cm / min;

[0030] 3) Carry out cover layer welding on the root layer weld: the arc moves in a zigzag shape 5, welding parameters: welding current is 260A, welding voltage is 23V, and welding speed is 25-35cm / min.

[0031] The said overlapping of steel bars means that the ends of two steel bars are folded an...

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Abstract

The invention discloses a method for overlap welding of steel bars by adopting flux-cored CO2 gas shielded welding wires. The method is characterized in that an inverter type CO2 gas shielded welding machine is utilized as welding equipment, the ER501T-1 CO2 flux-cored gas shielded welding wires are adopted, and the steel bars are HRB335 ribbed steel bars with phi being 20mm-30mm. The method comprises the following steps that 1) the steel bars are overlapped, and spot welding is conducted on the overlapped steel bars; 2) root-layer welding is conducted on the overlapped weld joints of the steel bars, wherein an electric arc moves linearly, as for welding parameters, a welding current is 260A, a welding voltage is 23V, and welding speed is 35-40cm / min; 3) covering-layer welding is conducted on the root-layer weld joints, the electric arc moves in a zigzag mode, as for welding parameters, a welding current is 260A, a welding voltage is 23V, and welding speed is 25-35cm / min. The method can increase the welding speed, enhance rust resisting capability of the weld joints, prevent pore defects, and achieve the fact that cleaning does not need to be conducted in a welding process.

Description

technical field [0001] The invention relates to a steel bar lap welding method. Background technique [0002] In the prior art, the lap welding of steel bars mainly uses the welding method of electrode arc welding, which has the disadvantages of unstable welding quality and low production efficiency. [0003] Using solid wire CO 2 Semi-automatic gas shielded welding is a low-hydrogen welding method, and the surface of the steel bar is required to be clean and free of dirt before welding. Because in the actual construction process, there are rust and other dirt on the surface of the steel bar during welding, so defects such as pores and slag inclusions inevitably exist after the steel bar is welded, which affects the welding quality. Contents of the invention [0004] The technical problem to be solved by the present invention is to provide a steel bar lap welding method, which has the characteristics of avoiding defects such as welding pores and slag inclusion, eliminati...

Claims

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Application Information

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IPC IPC(8): B23K9/16
CPCB23K9/0216B23K9/173
Inventor 王迎军张大刚何生贵焦荣格苏召王秉洪
Owner STATE GRID CORP OF CHINA
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