Transverse-butt-joint welding method for hull structural steel and forged steel

A technology of structural steel and welding methods, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve problems such as low weld strength and heavy welding workload, so as to ensure welding quality and eliminate welding Effects of reducing stress and reducing welding workload

Active Publication Date: 2015-12-30
WUCHANG SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a butt welding method of steel for hull structure and forged steel, which solves the problems of low weld seam strength and large welding workload existing in the horizontal butt welding method of high-strength st

Method used

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  • Transverse-butt-joint welding method for hull structural steel and forged steel
  • Transverse-butt-joint welding method for hull structural steel and forged steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Embodiment 1, including the following steps:

[0022] (1) Steps to form the groove: such as figure 1 As shown, grooves are formed at the butt joints of special 902 steel with a thickness of 40mm and SA508-3 forged steel with a thickness of 30mm without leaving roots. The inclination angle of the special 902 steel side groove is larger than that of SA508-3 forged steel side. 30°, a single V-shaped butt groove is formed when butting, the butt groove angle is 60°, the part of the special 902 steel that is thicker than SA508-3 forged steel is cut, and the cut length is 50mm, so that both sides of the butt groove Contour; the end faces within the groove and within 50mm on both sides of the groove should be free of water stains, oil stains, rust, slag and other debris that affect the welding quality;

[0023] (2) One-side surfacing step: preheat the SA508-3 forged steel groove area to 120℃, and then use manual arc welding and φ4mm CHE58-1HR electrode to perform surfacing on the SA...

Example Embodiment

[0029] The steps of Embodiment 2 are exactly the same as those of Embodiment 1, except for the process parameters in each step:

[0030] In the step of forming the groove, the inclination angle of the special 902 steel side groove is 20° larger than that of the SA508-3 forged steel side groove, the butt groove angle is 55°, and the cutting length is 45mm;

[0031] In the single-side surfacing step, preheat to 80°C;

[0032] In the preheating step, the butt groove groove gap is 4mm, the butt groove angle is 55°, and a Q345R steel liner with a thickness of 4mm is provided; the preheating temperature reaches 80°C to start welding;

[0033] During the welding step, the temperature between passes is controlled at 80°C during welding.

[0034] In the single-sided surfacing step and welding step of the above embodiments, the involved electrode needs to be baked at 380-400°C for 1 to 2 hours before welding, and put it in a heat preservation tank and take it for use. The unused electrode after 4...

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Abstract

The invention relates to a transverse-butt-joint welding method for hull structural steel and forged steel, and belongs to welding methods for high-strength steel materials. The problems of low weld joint strength and large workload existing in an existing transverse-butt-joint welding method for high-strength structural steel and high-strength forged steel are solved. The transverse-butt-joint welding method includes the steps of groove forming, single side bead welding, preheating and welding. Machining is easy, welding deformation is effectively reduced, transverse-butt-joint welding of special steel 902 and forged steel SA508-3 is smoothly achieved and pass a weldability test and welding procedure qualification, labor efficiency can be improved, welding materials, electric energy and labor hour can be saved, the production cost is reduced, the shipbuilding cycle is shortened, and the blank of welding ship structural steel and high-strength forged steel in China is filled up.

Description

technical field [0001] The invention belongs to a welding method between high-strength steel materials, and in particular relates to a transverse butt welding method of ship hull structure steel and forged steel. Background technique [0002] Welding technology is one of the key technologies of modern shipbuilding engineering, and the quality of ship welding in hull construction is an important indicator for evaluating shipbuilding quality. In the field of steel structure manufacturing involving special requirements and harsh working conditions (such as irradiation conditions), high-strength steel occupies an increasingly important position and has been widely used in ships, bridges, petrochemicals, high-rise building construction, and nuclear power plant construction. and other fields. Internationally, high-strength steel welding technology has developed rapidly in terms of welding material composition and process design, and its application fields are also expanding. The...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/04B23K9/235B23K33/00B23K103/04
CPCB23K9/00B23K9/04B23K9/235B23K33/004B23K2103/04
Inventor 王波赵钦之
Owner WUCHANG SHIPBUILDING IND
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