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Submerged arc-welding method of steel for high strength pressure vessel

A pressure vessel and submerged arc welding technology, which is applied to welding medium, welding equipment, welding equipment, etc., can solve the problems of no preheating and no heat treatment, etc., and achieves easy welding operation, excellent mechanical properties of strength and toughness and crack resistance , excellent low temperature impact toughness and the effect of safety reserve

Inactive Publication Date: 2009-10-28
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a welding process that solves the problem of submerged arc welding process and matching material welding without preheating before welding and without heat treatment after welding in the manufacturing process of steel thick plate structure for large pressure vessel steel

Method used

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  • Submerged arc-welding method of steel for high strength pressure vessel

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Effect test

Embodiment 1

[0019] Base material: Quenched and tempered container steel with tensile strength 610MPa, thick plate combination 44mm+44mm. The size of the test plate is 600mm×400mm×44mm, the submerged arc welding groove adopts double-sided V-shaped asymmetric groove, the groove angle is 60°, and the blunt edge is 4mm

[0020] Welding material matching:

[0021] Welding wire: its chemical composition and weight percentage are: C 0.07, Si 0.06, Mn 1.80, Ni 0.29, Ti 0.12, Mo 0.35, P≤0.012, S 0.006, and the rest are iron and unavoidable impurities.

[0022] The diameter of the welding wire is Φ4.0mm, and it is matched with the sintered flux SJ105Q for welding, and the mechanical properties of the deposited metal are R e1 : 525MPa, R m : 615MPa, A: 29%, Z: 73%, -40°Ca KV Impact energy: 166J;

[0023] Welding process parameters are: welding current 700A, welding voltage 36V, welding speed 30cm / min, welding line energy 50kJ / cm; flux baking system is 350℃×1h; Until the weld is filled; the inte...

Embodiment 2

[0026] Base material: Quenched and tempered container steel with a tensile strength of 670MPa, thick plate combination of 50mm+50mm. The size of the test plate is 600mm×400mm×50mm, the submerged arc welding groove adopts double-sided V-shaped asymmetric groove, the groove angle is 60°, and the blunt edge is 4mm.

[0027] Welding material matching:

[0028] Welding wire: its chemical composition and weight percentage are: C 0.09, Si 0.09, Mn 1.83, Ni 0.31, Ti 0.13, Mo0.30, P≤0.011, S 0.007, and the rest are iron and unavoidable impurities.

[0029] The diameter of the welding wire is Φ4.0mm, and it is matched with the sintered flux SJ105Q for welding, and the mechanical properties of the deposited metal are R e1 : 525MPa, R m : 615MPa, A: 29%, Z: 73%, -40°Ca KV Impact energy: 166J.

[0030] Welding process parameters are: welding current 700A, welding voltage 36V, welding speed 30cm / min, welding line energy 50kJ / cm; flux baking system is 350℃×1h; Until the weld is filled; ...

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Abstract

The invention discloses a submerged arc-welding method of thick steel slab for large pressure vessel with tensile strength of 610-670 MPa, which solves the currently existing defects that the impact energy of deposited metal and the actual joint tenacity can not meet the welding requirements for the production of large high-strength thick steel slab structure. A measure adopted by the invention is as follows: the method comprises the following steps of: adopting pressure vessel steel with tensile strength of 610-760 MPa and thickness of 44mm to 55mm; using matched welding materials: the tensile strength of a welding wire is 610-670 MPa with diameter of 4.0mm and welding flux SJ105Q is adopted; adopting an unsymmetrical double-side V-shaped groove with an angle of 60 degrees as the groove of submerged arc-welding and a blunted edge of 4mm; continuously welding at the butt joint till weld seams are filled up under the conditions of 700A welding current, 36V voltage, 30cm / min speed and 50kJ / cm energy input; using a welding flux roasting system of 350 DEG C multiplied by 1h; and adopting interlayer temperature of 100 DEG C to 150 DEG C. In the invention, preheating is not required before welding and heat treatment is not needed after welding and joints have good low temperature impact toughness and safety storage.

Description

technical field [0001] The invention relates to a submerged arc welding process for steel thick plates for large pressure vessels, which is suitable for submerged arc welding of thick plate structures for high-strength pressure vessel steels with a tensile strength of 610 MPa, and belongs to thick steel plates for large pressure vessels Structural manufacturing welding technology field. Background technique [0002] As my country's large-scale pressure vessel steel design gradually develops towards high-parameter and large-scale aspects. In order to meet the construction needs of various containers and storage tanks, Wuhan Iron and Steel (Group) Corporation has developed a steel plate for high-strength and high-performance pressure vessels. It has excellent strength and toughness matching. The improvement of the performance of the base material puts forward urgent requirements for matching welding materials and welding processes. [0003] The main problem at present: the ...

Claims

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Application Information

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IPC IPC(8): B23K9/18B23K9/025B23K9/095B23K33/00B23K35/12B23K35/30B23K103/04
Inventor 缪凯刘吉斌胡因洪牟文广黄治军王玉涛陈浮习天辉余酒泉胡家国
Owner WUHAN IRON & STEEL (GROUP) CORP
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