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A stainless steel hot-rolled coil welding method

A welding method and technology for hot-rolled coils, applied in welding equipment, welding accessories, welding/welding/cutting items, etc., can solve problems such as affecting the continuous pickling process, increasing welding operation time and labor intensity of workers, and welding joint fractures. , to achieve the effect of eliminating the groove processing and scale mechanical removal process, efficient and fully automated welding, and ensuring the shape of the weld

Active Publication Date: 2021-05-11
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, ferritic stainless steel with high interstitial atom content (C, N≥0.03wt%) has martensitic transformation and grain coarsening in the heat-affected zone after arc welding, resulting in brittleness and a greater risk of weld joint fracture Generally, preheating and post-weld heat treatment are used to reduce brittleness, which affects the continuous pickling process. At present, it mainly relies on manual welding of stiffeners to strengthen the weld, which increases the welding time and labor intensity of workers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]The front and rear rolls were selected 10 cr17 ferritic stainless steel hot rolled roll plate, and the front and rear volume thickness was 4.5 mm.

[0025](1) Protective gas preparation and flow regulation: the use of argon conducts frontal gas protection, and the active gas in the gas is O22% of the content, the gas flow rate of 30 l / min;

[0026](2) Welding material and its diameter selection: welding material use ER309L-Si solid wire, wire diameter 1.2mm;

[0027](3) Slope preparation: use shear cross-section group to be used as the type I type slope;

[0028](4) Back shaping: forced molding by copper pad; 25mm thickness of the liner, 60 mm width, 4 mm, depth 1 mm;

[0029](5) Set the gap selection: the gap is 1.7mm;

[0030](6) Welding parameters are selected and welded: the welding voltage is 26.5V, the wire feed speed is 11.5 m / min, the welding speed is 0.85 m / min, and the torch is 20mm.

[0031]Welding joint bending performance test: only removes the remaining pressure surface, bendin...

Embodiment 2

[0034]The front and rear volume plates were selected from the 022Cr12ti ferrite stainless steel hot rolled coil, and the front and rear volume thickness was 7.0 mm.

[0035](1) Protective gas preparation and flow regulation: the use of argon conducts frontal gas protection, and the active gas in the gas is O22% of the content, the gas flow rate of 35 l / min;

[0036](2) Welding material and its diameter selection: welding material use ER309L-Si solid wire, wire diameter 1.2mm;

[0037](3) Slope preparation: use shear cross-section group to be used as the type I type slope;

[0038](4) Back shaping: mandatory molding with copper pads; 40 mm thickness of the liner, 80 mm width, 5 mm width, depth 1 mm;

[0039](5) Set the gap selection: the gap is 1.7mm;

[0040](6) Welding parameters Select and weld: the welding voltage is 26.0V, the wire feed speed is 12.5 m / min, the welding speed is 0.85 m / min, the torch height is 24mm.

[0041]Welding joint bending performance test: only removes the remaining pres...

Embodiment 3

[0044]The front and rear volume plates are selected from the double phase stainless steel hot rolled coil, the front roll plate thickness is 5.5mm, and the thickness of the roll plate is 6.0 mm.

[0045](1) Protective gas preparation and flow regulation: the use of argon conducts frontal gas protection, and the active gas in the gas is O22% of the content, the gas flow rate of 35 l / min;

[0046](2) Welding material and its diameter selection: Welding material use ER308L-Si solid wire, wire diameter 1.2mm;

[0047](3) Slope preparation: use shear cross-section group to be used as the type I type slope;

[0048](4) Back shaping: mandatory molding with copper pad; the liner thickness is 40mm, the width is 80mm, the forming groove width is 4mm, and the depth is 1 mm;

[0049](5) Set the gap selection: set the gap 2.0mm;

[0050](6) Welding parameters selection and welding: the welding voltage is 27.0V, the wire feed speed is 12.5 m / min, the welding speed is 0.70 m / min, and the torch height is 23mm....

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Abstract

The invention discloses a stainless steel hot-rolled coil welding method, which belongs to the technical field of stainless steel material processing. The method adopts metal gas shielded welding, direct current reverse polarity connection, and single-layer single-pass butt welding process. The welding material is austenitic stainless steel solid wire. The front protection gas flow rate is controlled at 25~40L / min. The shear cross-section pair is used as a simple I-shaped bevel, and the back is forced to be formed with a copper liner. The thickness of the liner is 20-40mm, the width is 40-80mm, the width of the forming groove is 4-6mm, and the depth is 1mm. Applying this process, fully automatic welding can be realized, and with low heat input welding parameters, a welded joint of stainless steel hot-rolled coils with a thickness of 3~7mm and good plasticity and toughness can be obtained, and groove processing, surface oxide cleaning, and preheating can be exempted and post-weld heat treatment to improve the welding quality and welding efficiency of stainless steel hot-rolled coils.

Description

Technical field[0001]The present invention belongs to the technical field of stainless steel material, and is related to a stainless steel hot rolled coil welding method, which specifically relates to a welding method of ferritic stainless steel, austenite stainless steel and / or double phase stainless steel hot roll.Background technique[0002]Hot rolled coil is due to high temperature rolling, surface presence of oxide (Scale), in the subsequent cold rolling process, produces oxide pyramids to surface defects, need to be welded to each of the rolls to ensure continuous acid wash (Pickling) to remove the oxide. The processing of hot-rolled black rolls is typically first taken by mechanical processing slope, and then mechanically polls the oxidized skin near the groove to ensure the welds, while avoiding the inclusion defect in the weld area. These operations ensure welding quality, but affect productivity. And the welding process is protected by the back-sided inert gas to prevent o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/235B23K9/32B23K103/04
CPCB23K9/173B23K9/235B23K9/32
Inventor 王军伟李玉峰陈安忠马国财
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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