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Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process

A technology of gas shielded welding and high-strength steel plates, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve the effects of low welding technical requirements for workers, improved welding production efficiency, and improved overall reliability

Inactive Publication Date: 2015-03-25
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the present invention provides an easy-to-weld high-strength thick steel plate with a tensile strength of 700 MPa without preheating gas shielded welding welding process, which solves the need for preheating before welding large-scale welded structures with 40-80mm large-thickness high-strength steel plates and post-weld heat treatment production issues

Method used

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  • Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process
  • Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process
  • Easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process

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Embodiment 1

[0034] The preparation method in embodiment 1 is as follows:

[0035] The processing size of the steel plate sample is 80mm (thickness) × 200mm × 600mm, 2 pieces are 1 group, and according to the attached figure 1 It is required to process the groove, check the size of the processed steel plate, assemble it strictly according to the assembly requirements after the size is qualified, weld enough fixing devices to ensure the assembly accuracy and prevent the deformation of the steel plate, and spot weld the arc strike plate with a length of 120mm.

[0036] The specific welding steps are as follows:

[0037] (1) Welding base metal: The thickness of the large-thickness high-strength steel plate used is 80mm, and its main chemical composition weight percentage is: C: 0.05-0.12%, Si: 0.20-0.40%, Mn: 1.55-1.65%, P≤ 0.012%, S≤0.005%, Als: 0.020~0.040%, Ti: 0.015~0.030%, Mo: 0.010~0.025%, Cr≤: 0.020~0.030%, B: 0.0005~0.0020%, the rest is Fe and unavoidable impurities; the chemical co...

Embodiment 2

[0053] The difference between embodiment 2 and embodiment 1 is that in embodiment 2, the welding heat input is different, and embodiment 2 adopts THQ-70C welding wire with a diameter of Φ1.6mm, and the welding heat input control target is 35kJ / cm ;

[0054] Example 2 During welding, after each layer of welding, lightly tap along the weld seam with a hand hammer to release part of the welding stress and reduce deformation.

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Abstract

The invention relates to an easy-welding high-strength large-thickness steel plate preheating-free gas shielded welding process which mainly comprises the following contents that: the large-thickness easy-welding 700MPa-level high-strength steel plate with the thickness of 40-80mm is matched with a high-strength high-toughness welding wire with high deoxidation element content, a 80 percent Ar+20 percent CO2 active mixed gas shielded semi-automatic or automatic welding method is adopted, due to the preheating-free treatment before welding and heating-free treatment after welding, the welding process parameters are strictly controlled, the welding sequence is reasonably arranged, the asbestos cloth coated weldment is used for heat insulation, the defect-free excellent-performance welding joint is obtained, the tensile strength of the joint is not lower than the base metal standard requirement due to mechanical performance detection, the welding line and heat affected zone are good in texture, low-temperature charpy impact absorption work (KV2) is high in surplus amount, and the application environments of the low-temperature environment can be completely met. According to the method, the production process is reduced, the labor conditions of workers are improved, the production cost is saved, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a welding process for low-alloy high-strength steel, in particular to an easy-to-weld high-strength large-thickness steel plate gas shielded welding without preheating welding process, which is suitable for welded structural parts that require high toughness, safety and reliability Large key equipment. Background technique [0002] With the development of the national economy and the progress of modern industrial technology, the design of welding structures of various large-scale equipment is becoming larger, lighter and more parametric. However, the increase in material strength and thickness increases the difficulty of component welding production. The production of large-thickness and high-strength steel plates using traditional welding processes will bring a series of problems: [0003] (1) The special thermal cycle process of welding makes the structure of the welding heat-affected zone coarsen and embrittled, resulting i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173
Inventor 侯东华胡淑娥周兰聚王金华王南辉
Owner JIGANG GRP
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