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Arc welding method and arc welding device

An arc welding method and arc welding technology, applied in arc welding equipment, welding equipment, manufacturing tools and other directions, can solve the problems of embrittlement of the welding part, increase of welding time, deformation of the base metal, etc., to suppress the generation of sputtering, Stable buried space and stable welding effect

Active Publication Date: 2021-08-03
DAIHEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in multi-layer welding, the increase in welding man-hours becomes a problem
In addition, the amount of heat input increases, causing deformation of the base metal and embrittlement of the welded part to become a problem

Method used

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  • Arc welding method and arc welding device
  • Arc welding method and arc welding device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] figure 1 It is a schematic diagram which shows one structure of the arc welding apparatus concerning this Embodiment 1. The arc welding device according to Embodiment 1 is a consumable electrode type shielding gas arc welding machine capable of butt welding a base material 4 having a plate thickness of 9 to 30 mm in a single pass. In particular, the arc welding apparatus according to the first embodiment enters into the buried space 6a by controlling the welding current Iw (refer to Figure 4 ), the position of the front end portion 5a of the welding wire 5 can be stably maintained by performing the droplet transfer several times during the transition from the position of the front end portion 5a of the welding wire 5 to a high state, thereby stably maintaining the buried space 6a. The generation of sputtering can be suppressed.

[0047] The arc welding device according to Embodiment 1 includes a welding power source 1 , a welding torch 2 , and a wire feeder 3 .

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Embodiment approach 2

[0089] The arc welding method and arc welding apparatus according to the second embodiment are different from those of the first embodiment in the method of controlling the welding current Iw, and therefore the relevant differences will be mainly described below. The other configurations and functions and effects are the same as those in Embodiment 1, so corresponding parts are assigned the same reference numerals and detailed descriptions thereof are omitted.

[0090] Figure 7 It is a graph which shows the fluctuation|variation of the welding current Iw concerning this Embodiment 2. The horizontal axis of the graph represents time, and the vertical axis represents welding current Iw. In addition, the state of the droplet transfer accompanying the change of the welding current Iw is schematically shown in the upper part of the graph.

[0091] In Embodiment 2, the power supply unit 11 controls so that the high-current period is longer than the low-current period, and the wel...

Embodiment approach 3

[0094] The arc welding method and arc welding apparatus according to Embodiment 3 differ from Embodiment 1 in the method of controlling the welding current Iw, and the relevant differences will be mainly described below. The other configurations and functions and effects are the same as those in Embodiment 1, so corresponding parts are assigned the same reference numerals and detailed descriptions thereof are omitted.

[0095] Figure 8 It is a graph which shows the fluctuation|variation of the welding current Iw concerning this Embodiment 3. The horizontal axis of the graph represents time, and the vertical axis represents welding current Iw. In addition, the state of the droplet transfer accompanying the change of the welding current Iw is schematically shown in the upper part of the graph.

[0096] In Embodiment 3, the power supply unit 11 controls the output of the welding current Iw so that the welding current Iw increases stepwise during the high current period. For e...

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Abstract

Welding is performed by feeding the welding wire (5) to the welded part of the base material (4) and supplying a welding current with an average current of 300 A or more to the welding wire (5) to generate an arc between the tip of the welding wire (5) and the welded part The base material (4), in such a consumable electrode type arc welding method, enters the concave molten part formed in the base material (4) by passing the arc generated between the tip part and the welded part with the tip part The welding wire (5) is fed at the speed of the enclosed buried space (6a), so that the welding current fluctuates, and the welding current in the period of high current is controlled so that the process from the front end of the welding wire (5) to the molten part is performed many times during the period of large current. droplet transfer on the side of the .

Description

technical field [0001] The present invention relates to a consumable electrode type arc welding method and an arc welding device. Background technique [0002] One of the welding methods is a consumable electrode type shielding gas arc welding method (for example, Patent Document 1). The shielded gas arc welding method is a method of generating an arc between the welding wire fed to the welded part of the base material and the base material, and welding the base material by heat of the arc. In particular, in order to prevent oxidation of the base material that becomes high temperature, there is Welding is performed while spraying inert gas around the welded part. If it is a thin plate of about 5mm, it can also weld the butt joint of the base metal in a single pass. [0003] However, if it is a thick plate of 9 to 30 mm, the base metal cannot be welded in a single pass in the existing shielding gas arc welding method. To this end, the welding of thick plates is carried out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/095B23K9/09B23K9/173
CPCB23K9/09B23K9/095B23K9/173B23K9/092B23K9/0735B23K9/0737B23K9/0953B23K9/093B23K9/0956B23K9/125
Inventor 马场勇人惠良哲生
Owner DAIHEN CORP
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