A lap resistance welding method for high-strength strip steel with carbon equivalent greater than 0.5

A high-strength, carbon-equivalent technology, applied in resistance welding equipment, welding/welding/cutting items, welding equipment, etc., can solve problems that affect the life of welding wheels, work roll consumption, increase the risk of weld fracture, welding spatter, etc. problems, achieve good toughness and surface quality, increase post-weld annealing function, and economical and reliable control

Active Publication Date: 2019-07-02
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase in demand for high-strength steel, it is difficult to ensure the connection performance of the strip steel in the production process due to the high carbon equivalent in the alloy composition, the proportion of brittle and hard elements, and the strength of hard rolled coils, and the crack sensitivity is relatively high. Large and insufficient fusion of the weld zone increases the risk of weld fracture
[0003] For narrow lap resistance welding of high-strength strip steel, due to its special alloy composition design, when the welding line energy is low, insufficient fusion is likely to occur inside the weld, which deteriorates the performance of the welded joint; when the welding line energy is high , will cause welding spatter and produce poor surface quality, directly affect the life of the welding wheel and the roll consumption of the work roll

Method used

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  • A lap resistance welding method for high-strength strip steel with carbon equivalent greater than 0.5
  • A lap resistance welding method for high-strength strip steel with carbon equivalent greater than 0.5
  • A lap resistance welding method for high-strength strip steel with carbon equivalent greater than 0.5

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A lap resistance welding method for 1.8 mm thick thermoformed steel plates with a carbon equivalent of 0.52, the chemical composition and weight percentage of the thermoformed steel plates are: C≤0.30%; Si≤0.50%; Mn≤1.50%; P≤ 0.030%; S≤0.010%; Cr≤0.50%; B≤0.005%; the balance is Fe and other trace elements; the tensile strength R of hard-rolled coils m is 1000MPa.

[0042] The method comprises the steps of:

[0043] (1) Weld high-strength steel plates on narrow lap resistance welding machines;

[0044] The parameters are controlled as follows: the welding current is 25KA; the electrode pressure is 16KN, and the welding speed is 10m / min. The lap on the operating side is 0.9mm, and the lap on the drive side is 2.1mm. The welding seam rolling applied to the overlapping part after welding is 19KN.

[0045] (2) After the welding is completed, enter the post-weld heat treatment process;

[0046] After the welding is completed, it will enter the weld annealing device. The ...

Embodiment 2

[0052] A lap joint resistance welding method of 1.8mm thick 1000MPa grade martensitic dual-phase steel plate with a carbon equivalent of 0.58, the chemical composition and weight percentage of the hot-formed steel plate are: C≤0.25%; Si≤0.80%; Mn≤ 0.80%; P≤0.035%; S≤0.030%; Alt≥0.020%. The balance is Fe and other trace elements; the tensile strength R of its rolled hard coil m It is 1400MPa.

[0053] The method comprises the steps of:

[0054] (1) Weld high-strength steel plates on narrow lap resistance welding machines;

[0055]The parameters are controlled as follows: the welding current is 23KA; the electrode pressure is controlled at 17KN, and the welding speed is 9m / min. The lap on the operating side is 1.1mm, and the lap on the drive side is 2.2mm. The welding seam rolling force applied to the overlapping part after welding is 19KN.

[0056] (2) After the welding is completed, enter the post-weld heat treatment process;

[0057] After the welding is completed, it w...

Embodiment 3

[0063] A lap resistance welding method for 2 mm thick thermoformed steel plates with a carbon equivalent of 0.52, the chemical composition and weight percentage of the thermoformed steel plates are: C≤0.30%; Si≤0.50%; Mn≤1.50%; P≤0.030 %; S≤0.010%; Cr≤0.50%; B≤0.005%; the balance is Fe and other trace elements. The tensile strength R of its rolled hard coil m is 1000MPa.

[0064] The method comprises the steps of:

[0065] (1) Weld high-strength steel plates on narrow lap resistance welding machines;

[0066] Its parameters are controlled as follows: the welding current range is 24KA; the electrode pressure control range is 17KN, and the welding speed range is 8m / min. The overlapping range of the operating side is 1.1mm, and the overlapping amount of the transmission side is 2.3mm. The range of weld rolling applied to the lap joint after welding is 19KN.

[0067] (2) After the welding is completed, enter the post-weld heat treatment process;

[0068] After the welding is...

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Abstract

The invention discloses a lap resistance welding method of high-strength strip steel with the carbon equivalent being greater than 0.5. The lap resistance welding method comprises the following steps that a high-strength steel plate is welded on a narrow lap resistance welding machine; and after the welding is completed, a postweld heat treatment technology is carried out. The high-strength strip steel mainly comprises the following chemical components, by weight percentage, less than or equal to 0.30% of C, less than or equal to 0.80% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.035% of P, 0.030% of S and the balance Fe and other microelements. The tensile strength Rm of a rolled hard coil of the high-strength strip steel is greater than or equal to 800MPa. By adopting an automatic resistance welding technology for connecting the strip steel and by matching with postweld heat treatment, the welding residual stress is eliminated, a welding joint structure is improved, and continuous stable production of high-strength steel plate products is ensured.

Description

technical field [0001] The invention belongs to the field of metal material welding, and in particular relates to a lap resistance welding method of high-strength strip steel with a carbon equivalent greater than 0.5. Background technique [0002] With the development of the automobile industry, countries around the world have increasingly stringent requirements on automobile safety, energy saving and emission. The use of ultra-high-strength steel can not only reduce the weight of automobiles, achieve energy saving and emission reduction, but also improve the safety of automobiles. In order to take into account both lightweight and collision safety, high-strength steel plates emerged as the times require. In order to meet the needs of this development, domestic and foreign steel industries have successively completed the development of various high-strength steels, and their market demand is gradually expanding. However, with the increase in demand for high-strength steel, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K11/00B23K11/36
CPCB23K11/00B23K11/36B23K2103/04
Inventor 张武詹华计遥遥刘永刚谷海容刘伟成昌晶王伟峰孙晨阳
Owner MAANSHAN IRON & STEEL CO LTD
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