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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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  • 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 structural steel and high-strength forged steel. Horizontal butt welding of 902 steel for base metal and SA508-3 forged steel to save welding materials, electric energy and man-hours, and easy to process, effectively reducing welding deformation

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
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Effect test

Embodiment 1

[0021] Embodiment 1, comprises the following steps:

[0022] (1) Groove forming steps: such as figure 1 As shown, grooves are formed on 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. 30°, forming a single V-shaped butt joint groove when butt joint, the butt joint groove angle is 60 °, the part of the special 902 steel side thicker than the SA508-3 forged steel is beveled, and the bevel length is 50mm, so that the two sides of the butt joint bevel Contour height; water stains, oil stains, rust, hanging slag and other sundries that affect the welding quality should be removed from the end faces within 50mm of the groove and both sides of the groove;

[0023] (2) One-side surfacing welding step: Preheat the SA508-3 forged steel groove area to 120°C, and then use manual arc welding and φ4mm CHE58-1HR electrode to perform surfacing welding on the SA508-3 forged steel groove. The shape of the l...

Embodiment 2

[0029] Embodiment 2, is exactly the same as the step of embodiment 1, and difference is only in the process parameter in each step:

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

[0031] In the surfacing step on one side, preheat to 80°C;

[0032] Preheating step The gap between the butt groove and the groove is 4mm, the angle of the butt groove is 55°, and a Q345R steel liner with a thickness of 4mm is installed; the preheating temperature reaches 80°C and starts welding;

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

[0034] In the single-side surfacing welding step and welding step of each of the above-mentioned embodiments, the electrodes involved need to be baked at 380-400°C for 1-2 hours before welding, and put them into the heat p...

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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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