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Process for producing arc-welded structural member

An arc welding and structural component technology, applied in arc welding equipment, welding media, manufacturing tools, etc., can solve the problems of reduced strength, fatigue characteristics, corrosion resistance, etc., achieve a large degree of freedom, excellent resistance to molten metal embrittlement cracking effect

Inactive Publication Date: 2015-02-04
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If molten metal embrittlement cracks occur, this becomes the base point of corrosion and the corrosion resistance decreases
In addition, there are cases where strength and fatigue characteristics are lowered and become a problem

Method used

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  • Process for producing arc-welded structural member
  • Process for producing arc-welded structural member
  • Process for producing arc-welded structural member

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0067] The molten Zn-Al-Mg-based plated steel sheet shown in Table 1 was placed horizontally, and a weld bead (build-up welding) was formed on the surface of the steel sheet by an arc generated from a horizontally moving torch. The welding conditions are described in Table 1. For the section perpendicular to the direction of the weld bead including the weld seam and its nearby base metal, after mirror grinding and corrosion with nitric acid ethanol corrosion solution with a concentration of 0.2 volume % nitric acid, a scanning electron microscope is used to observe the weld bead seam. Near the edge, measure Figure 5 The length of the coating evaporation area shown by the symbol L in the middle.

[0068] [Table 1]

[0069]

[0070] Image 6 Indicates its result. Image 6 The case where the length of the plating evaporation region is 0.3 mm or more is drawn with the ○ mark, and the case of less than 0.3 mm is drawn with the X mark. With welding input heat Q(J / cm) and CO...

experiment example 2

[0072] The molten Zn-Al-Mg system plated steel sheet shown in Table 1-2 (the plate thickness of the plated plate is 2.6 mm) is placed horizontally, and a weld bead is formed on the surface of the steel plate by an arc generated from a horizontally moving welding torch (surfacing welding ( Bird On Plate)). Welding conditions are recorded in Table 1-2. By observing the vicinity of the edge of the weld bead with the same method as in the above-mentioned experimental example 1, it is determined that Figure 5 The length of the coating evaporation area shown by the symbol L in the middle.

[0073] [Table 1-2]

[0074]

[0075] Figure 8 Indicates its result. Figure 8 The case where the length of the plating evaporation region is 0.3 mm or more is drawn with the ○ mark, and the case of less than 0.3 mm is drawn with the X mark. With welding input heat Q(J / cm) and CO in shielding gas 2 Concentration C CO2 (volume%) is related to C CO2 =205Q -0.32 The curve of is the boun...

Embodiment 1

[0090]A cold-rolled steel strip with a thickness of 3.2 mm and a width of 1000 mm having the composition shown in Table 2 was used as a coating original plate, and passed through a molten coating line to produce molten Zn-Al-Mg systems with various coating compositions. Plated steel. Each molten Zn-Al-Mg-based plated steel sheet was subjected to gas-shielded arc welding according to the test method shown below, and the influence of the shielding gas composition on the resistance to molten metal embrittlement cracking was investigated. The composition of the plating layer, the amount of plating deposition, and the composition of the shielding gas are shown in Table 4 below. The composition of the protective gas applied to the example of the present invention contains CO 2 : 0 to 16% by volume, remainder: one or more of Ar and He (the same applies to Examples 2 and 3 described later).

[0091] [Table 2]

[0092]

[0093] (Test method for resistance to molten metal embrittl...

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Abstract

[Problem] To provide an arc-welded structural member which includes a Zn-Al-Mg-coated steel plate member and has excellent molten-metal brittle crack resistance, without involving a restriction on the kind of the steel of the plated base or a considerable increase in cost. [Solution] When a welded structural member is produced by bonding steel materials to each other by gas-shielded arc welding, a hot-dip Zn-Al-Mg-coated steel plate member is used as at least one of the members to be bonded and use is made of a shielding gas which comprises, as the base, Ar gas, He gas, or a gas mixture of Ar and He and which has been regulated so as to have a CO2 concentration CCO2 (vol%) that satisfies relationship (2) in accordance with the welding heat input Q (J / cm). 0<=CCO2<=2900Q-0.68 (2)

Description

technical field [0001] The present invention relates to a method of manufacturing an arc welded structural member excellent in resistance to molten metal embrittlement cracking, which is formed by using a molten Zn-Al-Mg plated steel sheet member for one or both members to be joined. Background technique [0002] Since the hot-dip zinc-based plated steel sheet is excellent in corrosion resistance, it is used in a wide range of applications including building components and automotive components. In particular, molten Zn—Al—Mg-based plated steel sheets maintain excellent corrosion resistance over a long period of time, and therefore demand has increased as a material to replace conventional molten zinc-plated steel sheets. [0003] The coating of the molten Zn-Al-Mg plated steel sheet is as described in Patent Documents 1 and 2, and has a ratio of Zn / Al / Zn 2 In the matrix of the Mg ternary eutectic, the primary crystal Al phase or the metal phase of the primary crystal Al ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23B23K9/16B23K9/173C22C18/04C22C38/14C22C38/00
CPCB23K35/38C22C38/14C22C38/12C22C38/04B23K9/173C22C38/00C22C18/04C22C18/00C22C38/06C22C38/02B32B15/013B23K35/383B23K35/004B23K9/23B23K9/235C23C2/06
Inventor 细见和昭延时智和朝田博
Owner NISSHIN STEEL CO LTD
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