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Narrow lap welding process for cold-rolled low-alloy high-strength steel

A welding process and low-alloy technology, applied in the field of steel strip welding, can solve the problems of difficult welding seam quality, affecting the quality of strip steel, and high alloy content, reducing production costs and equipment costs, avoiding welding seam belt breaking accidents, huge economic effect

Inactive Publication Date: 2019-06-04
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN201510235330 It can be seen from its embodiments that this method is only applicable to the mutual welding between dual-phase steels, and does not take into account the welding between low-alloy high-strength steels and ordinary carbon steels, which has limitations for issuing production plans
At the same time, low-alloy high-strength steel, due to its high alloy content and high carbon equivalent, is prone to hardened ferrite and pearlite structures in the welding heat-affected zone during welding, and is more sensitive to cracks, so its weldability is poor and relatively low. It is difficult to obtain flat and smooth weld seam quality, and it is easy to cause belt breakage accidents along the weld seam on the production line with high tension, which will bring inconvenience to production, and will also affect the quality of strip steel and cause certain damage to equipment

Method used

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  • Narrow lap welding process for cold-rolled low-alloy high-strength steel
  • Narrow lap welding process for cold-rolled low-alloy high-strength steel
  • Narrow lap welding process for cold-rolled low-alloy high-strength steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Production varieties: HC340 low-alloy high-strength steel and DC01 plain carbon steel

[0027] Specifications: 1.0*1250mm.

[0028] The strip steel is welded by a narrow lap welder on a continuous annealing line.

[0029] Welding process: The head and tail of the strip are sheared at the entrance, and the tail of the front coil and the head of the rear coil are lapped before welding.

[0030] Welding process: welding current is 16.5KA; welding speed is 15m / min; welding wheel pressure is 20KN; for high pressure.

[0031] The strip steel welded by the above welding process passes through the cleaning section, looper, heating furnace, skin-passing unit, etc., and is finally produced. The appearance of qualified weld seam is as follows: figure 1 shown.

Embodiment 2

[0033] Production varieties: HC340 low-alloy high-strength steel and HC420 low-alloy high-strength steel

[0034] Specification: 1.5*1500mm.

[0035] The strip steel is welded by a narrow lap welder on a continuous annealing line.

[0036] Welding process: The head and tail of the strip are sheared at the entrance, and the tail of the front coil and the head of the rear coil are lapped before welding.

[0037] Welding process: Welding current is 20KA; welding speed is 13m / min; welding wheel pressure is 24KN; overlap is 1.5mm; compensation is 1mm; after welding, the rolling wheel trims the weld, and the rolling pressure is selected as high pressure .

[0038] The strip steel welded by the above welding process passes through the cleaning section of the continuous annealing line, looper, heating furnace, skin pass machine, etc., and finally produces finished products. After the strip steel is off the production line, the weld quality is good without cracks and damage. The app...

Embodiment 3

[0040] Production varieties: HC340 low-alloy high-strength steel and DC01 plain carbon steel

[0041] Specifications: 2.0*1250mm.

[0042] The strip steel is welded by a narrow lap welder on the continuous continuous annealing production line.

[0043] Welding process: The head and tail of the strip are sheared at the entrance, and the tail of the front coil and the head of the rear coil are lapped before welding.

[0044] Welding process: welding current is 22KA; welding speed is 10m / min; welding wheel pressure is 25KN; overlap is 2mm; .

[0045] The strip steel welded by the above welding process passes through the cleaning section, looper, heating furnace, skin-passing unit, etc., and finally produces finished products. The appearance of qualified weld seam is as follows: image 3 shown.

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Abstract

The invention relates to a narrow lap welding process for cold-rolled low-alloy high-strength steel. A narrow lap welder of a continuous production line is used for welding, the strip tail of a formerroll of strip steel and the strip head of a following roll of strip steel are sheared through an inlet shear, and then the strip tail of the former roll of strip steel and the strip head of the following roll of strip steel are overlapped to be welded. The narrow lap welding operation of a low-alloy high-strength steel strip is realized, and conditions are provided for continuous production of the low-alloy high-strength steel strip. The low-alloy high-strength steel strip has high weld strength and high plasticity and toughness, the phenomena such as open welding and fractures cannot occur when undergoing multiple times of turning, reverse bending and high-temperature heat preservation on a large tension production line, the occurrence of a weld seam breakage accident is avoided, and continuous production of the production line is ensured.

Description

technical field [0001] The invention relates to the technical field of steel strip welding, in particular to a narrow lap welding process for cold-rolled low-alloy high-strength steel. Background technique [0002] The continuous annealing line is a production line that welds strip steel together to achieve uninterrupted production. It is an important technological means for modern iron and steel enterprises to improve production efficiency and reduce production costs. It is widely used in production fields such as combined pickling and rolling production lines, continuous annealing production lines and continuous continuous annealing and annealing production lines. The narrow lap welding machine belongs to resistance welding, which uses the resistance heating effect generated by the current to heat the welded workpiece between the compression and the electrode to a melting or shaping state, so that it can be combined. For welding low-alloy high-strength steel such as HC340...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/24
Inventor 刘喆陈力军朱琳王庆静林卫全徐令喜冯慧平
Owner SD STEEL RIZHAO CO LTD