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A kind of saw welding method of weathering steel weld alloy and weathering steel

A welding method and technology of weathering steel, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of the application and promotion of weathering steel, the corrosion resistance of weld metal and the mismatch of mechanical strength properties.

Active Publication Date: 2017-12-08
ZHEJIANG SHENGDA STEEL TOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual production, the corrosion resistance and mechanical strength of the weld metal often do not match, which brings great obstacles to the application and promotion of weathering steel in the domestic iron tower industry.

Method used

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  • A kind of saw welding method of weathering steel weld alloy and weathering steel
  • A kind of saw welding method of weathering steel weld alloy and weathering steel
  • A kind of saw welding method of weathering steel weld alloy and weathering steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A welding method for weather-resistant steel, using 8mm ASTM A871 GR65 weather-resistant steel, TH550-NQ-Ⅲ welding wire and SJ101 flux as raw materials, adopting I no-groove butt welding, including:

[0057] Grinding: Grinding the adjacent sides of the welding area until the metallic luster is exposed;

[0058] Spot welding assembly: perform tack welding on the polished groove weldment, control the root gap at 1mm, and control the length of each tack welding spot at 20mm, and the distance between every two tack welds is 200mm, positioning The welding wire used for welding is JM-55Ⅱ welding wire, and the positioning welding is carried out under the condition of conventional shielding gas protection;

[0059] Preheating before welding: After spot welding and assembly, preheat the groove, and set the preheating temperature to 42°C;

[0060] Formation of the cover welding layer: under the condition of flux protection, the groove is welded to form the cover welding layer; ...

Embodiment 2

[0066] This embodiment is basically the same as Embodiment 1, with some differences in:

[0067] The thickness of the raw material ASTM A871 GR65 weathering steel is 14mm, the groove angle is 60°, and the thickness of the blunt edge is 4mm. It is necessary to add steps between the preheating step before welding and the measurement step of the blunt edge temperature to form the bottom welding layer, fill Welding layer and cover welding layer, the formation of described bottoming welding layer undergoes the following steps successively:

[0068] The formation of the bottom welding layer: under the condition of flux protection, the groove is welded to form the bottom welding layer;

[0069] Flux and slag shell cleaning: During the welding process, an absorber should be used to recover unmelted flux every 200mm, and the mold slag shell formed by molten flux should be cleaned to remove slag inclusions produced by flux and weld metal.

[0070] The formation of each weld bead in the...

Embodiment 3

[0075] This embodiment is basically the same as Embodiment 2, with some differences in:

[0076] The thickness of the raw material ASTM A871 GR65 weathering steel is 18mm, the groove angle is 50°, and the gap at the root of the groove is controlled to 1.5mm.

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Abstract

The invention belongs to the technical field of welding, and relates to a weathering steel welding suture and a SAW welding method for weathering steel. The weathering steel welding seam alloy contains a variety of corrosion-resistant alloying elements, so that it can meet the requirements of use in harsh conditions.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a weather-resistant steel weld alloy and a SAW welding method of weather-resistant steel. The weather-resistant steel in the invention refers to ASTM A871 GR65 weather-resistant steel, and the welding wire model TH550-NQ-Ⅲ is a domestic commercially available model , the trace alloy elements include 0.35% Cu, 0.39% Ni, 0.40% Cr, 0.38% Si and 0.007% P, the flux is SJ101, and the impact tests of the weld alloys all examine the impact of the weld alloy at -40°C achievement. Background technique [0002] With the rapid development of UHV transmission projects in my country, in order to build economical and environmentally friendly integrated transmission lines, the research and development and application of new materials for iron towers and their manufacturing technologies are becoming increasingly urgent. Weather-resistant steel has excellent weather resistance and large load-beari...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42B23K9/18B23K9/23
Inventor 李朋包镇回戴刚平张国勋舒芳施洪亮吕闪闪吴顺兵
Owner ZHEJIANG SHENGDA STEEL TOWER
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