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The Method of Preventing Strip Breakage in Weld Seam of Thin Strip Steel

A strip steel welding seam and thin material technology, which is applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of large tension, enlargement, and broken strips of strip steel, and achieve reduced storage, reduced tension, Avoid the effect of weld tearing

Active Publication Date: 2021-02-05
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When passing through the tension leveler, the problem of high tension on the strip steel is magnified, especially when producing strip steel with a thin gauge below 0.3mm, it is very easy to cause strip breakage

Method used

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  • The Method of Preventing Strip Breakage in Weld Seam of Thin Strip Steel
  • The Method of Preventing Strip Breakage in Weld Seam of Thin Strip Steel
  • The Method of Preventing Strip Breakage in Weld Seam of Thin Strip Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: see Figure 1-Figure 5, a kind of method that prevents thin strip steel weld seam from being broken, described method comprises the following steps: 1) welding control; 2) entrance looper control; 3) continuous annealing control, 4) air knife control, 5) flattening correction control. The step 1) welding control; including using a wooden hammer to verify the weld 1-3 and a wooden hemispherical hammer to carry out a hammering test on the weld 1-3; Hammering at 15 cm and the middle position, if there is no cracking, the weld 1-3 is qualified; if cracking occurs, a second re-welding is required; the edge weld is set to asymmetrical edge filling operation, when the weld is on the crescent When the shearing position is ready to fill the edge, jog the position of the weld seam forward or backward by 5-10CM to ensure that after shearing, there is more than 2CM shearing amount at the weld seam. In this way, it can prevent the stress concentration at the weld 1-3...

Embodiment 2

[0030] see Figure 1-Figure 5 , in the implementation process of embodiment 1, when the width switching process in thin material production is aimed at, when the asymmetry of the weld seam becomes a shear crescent, it is necessary to move the weld seam position 5-10CM to the wider direction to ensure that after shearing , There is more than 2CM shear at the weld. 150 meters before entering the furnace, reduce the tension of the strip steel twice, the reduction is 15-20%, based on the tension of the narrow material, after passing the weld, increase the tension twice again to the normal tension of the strip steel in the current furnace area. The side baffles are opened 15 meters before the weld, and the opening distance is 50MM added to the width of the wide steel strip.

[0031] The tension leveler adopts the 3MM welding seam mode. At the same time, after the welding seam passes, the upper roller 1#, 2#, and 4# are pressed down first, and the 3# roller is lifted, and then 3#, ...

Embodiment 3

[0033] During the implementation of Example 1, send samples to detect the aluminum content 4 hours before switching thin materials. If the aluminum content is too low or too high, you can continuously add E1 ingots or D ingots for adjustment to ensure that after switching, the aluminum in the zinc liquid The content is controlled at 0.2-0.25%, and the temperature of the zinc liquid can be raised one roll in advance to ensure that the temperature remains at 465-467°C after switching.

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Abstract

The invention relates to a method for preventing weld seam strip breakage of thin material strip steel. The method is characterized by comprising the following steps of (1) welding control; (2) entryloop control; (3) continuous annealing control; (4) air knife control; and (5) leveling and withdrawing-straightening control. The method effectively avoids the technical problem of the weld seam strip breakage of the strip steel through the coordinated control of multiple steps.

Description

technical field [0001] The invention relates to a method for preventing weld seam breakage of thin strip steel, and belongs to the technical field of continuous hot-dip galvanizing. Background technique [0002] The main process of continuous hot-dip galvanizing unit includes: uncoiling - welding - inlet looper - lye cleaning - continuous annealing - zinc layer control - post-plating cooling - leveling and straightening - post-treatment - outlet looper - electrostatic oiling - coiling. In the prior art, during the welding process, in order to avoid the poor quality of the weld at both ends and the broken belt caused by stress concentration, we generally choose crescent shears to perform symmetrical shearing with the weld as the center on about 10 cm at both ends of the weld. Crescent as shown figure 1 , to ensure the safety of the weld. However, in actual production, shearing the crescent can effectively prevent the occurrence of weld tearing caused by stress concentration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00B23K37/00
CPCB23K33/00B23K37/00
Inventor 何锐孙磊
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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