A narrow lap rolling seam welding method for high silicon thin gauge oriented silicon steel

Abstract

The invention discloses a narrow-lap rolling seam welding method for high-silicon and thin-gauge oriented silicon steel: 1. The tail of the forward strip and the head of the rear strip are cut and then stopped on the welding machine respectively At the clamps at the entrance and exit, ensure that the plate shape is good; the front and rear strips are oriented silicon steel, with a silicon content of 3.0-3.5%, and a thickness of 0.2-0.3mm; 2. The front and rear strips are centered, and the centerline deviation of the strips is within ±3mm; 3 1. Brush the strip steel in the overlapped part to remove the surface oxide film, pollutants and impurities. The gap between the brush wheels is 0.2-0.3mm; 4. Before the front and rear strips are lapped, put a carbon steel plate Material; strip overlap 1‑1.2mm, lap compensation 0.5‑0.6mm; sheet thickness 0.2‑0.3mm, width 6‑9mm; by weight ratio, sheet composition: C: 0.02~0.07%, Mn : 0~0.9%, Al: 0.02~0.06%, P: 0~0.02%, Si: 0~0.03%, the balance is iron; 5. Welding seam welding current 8‑8.5KA, welding pressure 6‑7KN; welding The speed is 10-15mpm; after the welding electrode melts the steel, the rolling wheel presses the welding seam flat and clean with the rolling force of 11-15KN along with the welding wheel.

Description

technical field [0001] The invention relates to the technical field of welding, in particular to a narrow lap rolling seam welding method for high silicon thin specification oriented silicon steel. Background technique [0002] Oriented silicon steel has high silicon content and thin strip, the silicon content is up to 3.5%, and the thickness is generally 0.23 to 0.3 mm. And the higher the silicon content, the worse the material toughness and plasticity, [0003] The Chinese patent document with the application number of 200810301407.2 discloses a process method for the head and tail flash welding of non-oriented electrical steel used in the production of a cold-rolling and pickling unit, which can effectively improve the quality of the weld. The process method is: inserting low-carbon steel series steel of the same thickness and width as the non-oriented electrical steel between the front roll of non-oriented electrical steel and the back roll of non-oriented electrical st...

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Problems solved by technology

[0006] Oriented silicon steel has high silicon content, the resistance of the strip steel is large, and the heat generated during the welding process is large, which will cause spatter and surface burns

At the same time, due to the thin thickness of the strip steel, the weld seam is easy to perforate, and the toughness of the deposited area near the weld seam is also poor, and the weld seam is easy to break

When welding oriented silicon steel with high-silicon thin strips under the original narrow lap seam welding machine welding process, the welding quality is poor, and it is very easy to break the strip at the weld, which seriously affects the normal stability of the unit and the production efficiency is low.

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