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Submerged-arc welding method for low-carbon Q420qNH weathering resistant steel for bridge

A welding method and technology of weathering steel, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as increasing construction cost and prolonging construction period, and achieve excellent low-temperature impact toughness, promotion promotion, and excellent tensile properties. Effect

Inactive Publication Date: 2018-10-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The addition of Cu and Ni elements is inevitable for weather-resistant steel plates to meet the weather resistance performance, which increases the carbon equivalent and cold crack sensitivity of the steel plate to a certain extent. Although pre-weld preheating and post-weld heat treatment can achieve the mechanical properties of welded joints control to reduce the occurrence of welding cracks, but it also increases the construction cost and prolongs the construction period

Method used

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  • Submerged-arc welding method for low-carbon Q420qNH weathering resistant steel for bridge
  • Submerged-arc welding method for low-carbon Q420qNH weathering resistant steel for bridge
  • Submerged-arc welding method for low-carbon Q420qNH weathering resistant steel for bridge

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Experimental program
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Effect test

Embodiment 1

[0036] A kind of submerged arc welding welding method of low-carbon Q420qNH weathering steel for bridges, the specific steps are as follows:

[0037] Step 1, beveling:

[0038] Double-sided V-shaped symmetrical grooves are made on the Q420qNH steel plate used for bridges with a base plate combination of 30+30mm and a single-side base plate size of 400×200×30mm. The groove angle is 50°, and the blunt edge is 2.0mm. The pair gap is 1.0mm;

[0039] Step 2, preprocessing:

[0040] Use 600-mesh sandpaper to grind the V-shaped symmetrical groove and the steel plate within 5cm on both sides, and then clean it with acetone to remove rust and impurities to ensure the quality of the welded joint;

[0041] Step 3, soldering:

[0042] Carry out submerged arc welding, the welding current is 570A, the voltage is 27V, the welding speed is 390mm / min, and the welding line energy is 23.67kJ / cm.

[0043] The mechanical properties of the welded joint obtained by the above welding process are ...

Embodiment 2

[0045] A kind of submerged arc welding welding method of low-carbon Q420qNH weathering steel for bridges, the specific steps are as follows:

[0046] Step 1, beveling:

[0047] Double-sided V-shaped symmetrical grooves are made on the Q420qNH steel plate used for bridges with a substrate combination of 45+45mm and a single-sided substrate size of 400×200×45mm. The groove angle is 50°, and the blunt edge is 3.0mm. The pair gap is 1.3.0mm;

[0048] Step 2, preprocessing:

[0049] Use 600-mesh sandpaper to grind the V-shaped symmetrical groove and the steel plate within 5cm on both sides, and then clean it with acetone to remove rust and impurities to ensure the quality of the welded joint;

[0050] Step 3, soldering:

[0051] Carry out submerged arc welding, the welding current is 590A, the welding voltage is 28.5V, the welding speed is 330mm / min, and the welding line energy is 30kJ / cm;

[0052] The mechanical properties of the welded joint obtained by the above-mentioned we...

Embodiment 3

[0055] A kind of submerged arc welding welding method of low-carbon Q420qNH weathering steel for bridges, the specific steps are as follows:

[0056] Step 1, beveling:

[0057] Double-sided V-shaped symmetrical grooves are made on the Q420qNH steel plate used for bridges with a base plate combination of 60+60mm and a single-side base plate size of 400×200×60mm. The groove angle is 50°, and the blunt edge is 4.0mm. The pair gap is 2.0mm;

[0058] Step 2, preprocessing:

[0059] Use 600-mesh sandpaper to grind the V-shaped symmetrical groove and the steel plate within 5cm on both sides, and then clean it with acetone to remove rust and impurities to ensure the quality of the welded joint;

[0060] Step 3, soldering:

[0061] Carry out submerged arc welding, the welding current is 630A, the voltage is 31V, the welding speed is 300mm / min, and the welding line energy is 39kJ / cm;

[0062] The mechanical properties of the welded joint obtained by the above welding process are tes...

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Abstract

The invention discloses a submerged-arc welding method for low-carbon Q420qNH weathering resistant steel for a bridge and belongs to the technical field of welding of bridge steel medium-thick plates.The submerged-arc welding method comprises the specific steps that (1) a double-face V-shaped symmetrical groove is formed in double-butt-joint parent metal of a base material; (2) the V-shaped symmetrical groove and the two sides of the V-shaped symmetrical groove are polished and cleaned; and (3) submerged-arc welding is conducted. Through the welding technology, multi-pass continuous submerged-arc welding is achieved without weld preheating, postweld heat treatment and gas shielded arc welding priming in the welding process, an obtained welding joint is excellent in structure and mechanical performance, a simple, efficient and economical welding mode is achieved in the manufacturing process of a novel Q420qNH weathering resistant steel medium-thick plate structure for the bridge, and vital significance is achieved for facilitating popularization of the novel low-carbon weathering resistant bridge steel.

Description

technical field [0001] The invention belongs to the technical field of bridge steel plate welding, and in particular relates to a submerged arc welding method for low-carbon Q420qNH weathering steel used in bridges. Background technique [0002] The development of bridge construction technology and the increasing demand for road transportation have made bridge engineering continue to develop in the direction of larger construction scale, shorter construction period, longer service period, easier post-maintenance and multi-purpose. Bridge construction materials put forward higher requirements. Bridge steel will be subjected to severe corrosion in the actual application process and should have good corrosion resistance. Ordinary bridge steel usually adopts anti-corrosion methods such as coating anti-corrosion, cathodic protection, and composite materials to achieve anti-corrosion purposes, but these methods are costly. , Difficult maintenance and serious environmental polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K9/235
CPCB23K9/18B23K9/235
Inventor 胡军张世超刘悦张彬董营高彩茹杜林秀
Owner NORTHEASTERN UNIV LIAONING