TW202108279A - Welded member and manufacturing method thereof - Google Patents

Abstract

無。

Description

Welding component and manufacturing method thereof

The present invention relates to a welding component and a manufacturing method thereof.

Molten zinc (Zn)-based coated steel sheets have good corrosion resistance. Therefore, it is widely used in various steel products such as building components and automobile components. When molten Zn-based coated steel sheets are used to manufacture such steel sheet products, arc welding is often used to weld the coated steel sheets. However, when arc welding is performed on the molten Zn-based plated steel sheet, spatter may be remarkably generated and the quality may be lowered. This is because the melting point of Zn (about 906°C) is lower than that of Fe (about 1538°C), so that vapor of Zn is generated during arc welding, which makes the arc unstable.

When spatter adheres to the molten zinc Zn-based plated steel sheet, the appearance of the welded joint may be damaged. In addition, the part where the spatter adheres may form a starting point of corrosion, which may reduce the corrosion resistance of the welded member. In addition, if the step of removing spatter is further implemented, the manufacturing cost of the welded component will increase.

Among arc welding performed on galvanized steel sheets, a technique is known that uses a welding wire having a specific composition and uses argon gas containing a predetermined amount of carbon dioxide gas as a shielding gas (for example, refer to Patent Document 1).

[Prior Technical Literature] [Patent Literature] [Patent Document 1] Japanese Patent Publication "Japanese Patent Application Publication No. 2013-184216"

[The problem is solved by the invention] However, when arc welding a molten Zn-based plated steel sheet in the above-mentioned conventional technology, the suppression of spatter generation may not be sufficient. In addition, argon, which is relatively expensive, is often used as a shielding gas, and there is still room for improvement from the viewpoint of cost reduction.

An object of one aspect of the present invention is to provide a technique that can reduce the number of welded components produced by arc welding of molten Zn-based plated steel sheets, regardless of the type of shielding gas, caused by the arc welding. Splash.

[Means for Solving the Problem] In order to solve the above-mentioned problems, a method of manufacturing a welding member according to one aspect of the present invention includes: controlling the delivery of the welding wire so that the front end of the welding wire advances toward the welded part during the arc period, And the welded part is formed by contacting a plurality of molten Zn-based plated steel sheets as the base material with each other, and the front end of the welding wire is retracted from the welded part during the short-circuit period, and at the same time in the shielding gas atmosphere Next, the step of arc welding the base materials to each other, wherein, in the molten Zn-based plated steel sheet, the amount of plating adhesion on the surface forming the welded portion is 15 g/m ² or more and 250 g/m ² or less, when the distance between the front end of the welding wire and the welded part is set to D, and the diameter of the welding wire is R, when the short-circuit period transitions to the arc period, the The bonding wire is pulled up to a position conforming to 1.25R≦D≦8R.

In addition, in order to solve the above-mentioned problems, a welding member of one aspect of the present invention is a welding member manufactured by the above-mentioned method of manufacturing a welding member.

[Efficacy of invention] According to one aspect of the present invention, it is possible to reduce the spatter caused by the arc welding in the welded component manufactured by arc welding the molten Zn-based plated steel sheet regardless of the type of shielding gas.

As a result of the inventor’s intensive research, it was found that when arc welding is performed on molten zinc Zn-plated steel sheet, the wire delivery control system is to advance the welding wire to the base metal side during the arc period. During the short-circuit period, the welding wire is transferred backward in the direction away from the base metal. During the welding wire transfer control, when the short-circuit period is transitioned to the arc period, the distance of pulling the welding wire can be adjusted appropriately. From thinly-plated molten zinc-Zn-based coated steel sheets to thick-plated molten zinc-Zn-based coated steel sheets, it is possible to suppress spatter generated during arc welding of molten zinc-based Zn-based coated steel sheets.

[Manufacturing Method of Welded Components] The manufacturing method of the welded component in the embodiment of the present invention includes an arc welding step in which molten Zn-plated steel sheets as base materials are arc-welded to each other in a protective gas atmosphere. The base metal is the member to be welded. The molten Zn-coated steel sheet as the base material will be described below.

In this embodiment, the delivery of the welding wire is controlled so that the front end of the welding wire advances to the welded part during the arc period, and retreats from the welded part during the short-circuit period, and arc welding is performed at the same time step. The welded portion is formed by contacting molten Zn-based plated steel sheets as the base material with each other. In this embodiment, in the arc welding accompanied by a short circuit, the welding wire advances and retreats relative to the welded part depending on whether there is a short circuit. Examples of arc welding with the short circuit include short circuit transfer welding, ball transfer welding with short circuit, and pulse arc welding with short circuit.

[Advance and retreat of wire bonding] FIG. 1 is a diagram schematically showing an example of the flow of an arc welding method in an embodiment of the present invention. The period of the arc welding step in this embodiment is divided into an arc period and a short circuit period.

The symbol 300 in FIG. 1 indicates the initial state during the arc. The arc period refers to a period during which an arc is generated by the welding wire 10. The bonding wire 10 is arranged at a position where its tip is separated from the surface of the base material 20. At the beginning of the arc period, the distance from the front end of the welding wire 10 to the surface of the base material 20 is D. In addition, the diameter of the bonding wire 10 is R.

The welding wire 10 is also used as an arc electrode, and an arc 40 is generated between the welding wire 10 and the base material 20 by applying a welding voltage. As a result, a droplet 30 is generated at the front end of the bonding wire 10. The droplet 30 is formed by melting the welding wire 10 through the high temperature caused by the arc discharge. In addition, a molten pool 50 is generated on the surface of the base material 20. The molten pool 50 is formed of a molten material on the surface (for example, a plating layer) of the base material 20 that has become a high temperature due to arc discharge, and a droplet 30 dropped from the tip of the welding wire 10. The symbol A is the arc width (the width of the molten pool 50), which is substantially the same as the width of the bead described later.

During the arc period, the welding wire 10 advances so that its tip is close to the surface of the base material 20 (the molten pool 50). Symbol 400 in FIG. 1 indicates the final state of the arc period. The bonding wire 10 advances at a predetermined speed, for example. When the distance D becomes smaller, the spread of the arc 40 becomes smaller, and the arc width A becomes smaller. In addition, the longer the arc period, the larger the droplet 30 becomes.

The symbol 100 in FIG. 1 indicates the initial state during the short-circuit period. The short-circuit period refers to the period during which the bonding wire 10 and the base material 20 are electrically connected to each other through the melt. When the growing droplet 30 comes into contact with the molten pool 50, the two melt into one body to form a constricted portion 60. Since the bonding wire 10 and the base material 20 are both electrical conductors, a conduction path from the bonding wire 10 through the constricted portion 60 to the base material 20 is formed. Therefore, no arc discharge occurs during the short-circuit period.

The symbol 200 in FIG. 1 indicates the final state of the short-circuit period. In the present embodiment, when a short circuit occurs, the front end of the bonding wire 10 retreats and separates from the surface of the base material 20. In this embodiment, the position of the front end of the bonding wire 10 is pulled up to a predetermined distance D from the surface of the base material 20. Through the retreat of the bonding wire 10 as described above, the constricted portion 60 is stretched and thinned, and then cut. Then, it becomes the initial state of the arc period indicated by symbol 300. In this embodiment, in order to end the short-circuit period, a process for cutting off the constricted portion 60 can be further adopted as needed, such as increasing the welding current supplied to the welding wire 10.

In arc welding, the welding wire 10 as an arc electrode is usually supported by a welding torch. The forward/backward movement of the welding wire 10 can be carried out by bringing the welding torch closer to and away from the surface of the base material 20; it is also possible to support the welding torch at a certain distance away from the surface of the base material 20, and the welding torch can only The bonding wire 10 is moved forward or backward to the surface of the base material 20.

In addition, the arc electrode supported by the welding torch (for example, made of tungsten) and the welding wire 10 may be separated. In this case, the arc welding is performed by passing the front end of the welding wire 10 into the arc 40 generated by the arc electrode. Also in this case, the welding wire 10 is advanced to the surface of the base material 20 during the arc period. In addition, when the short-circuit period is about to end, the welding current is drastically reduced, and the welding wire 10 is retreated to be mechanically separated from the surface of the base material 20.

Generally, the part to be welded on the surface of the base material 20 is a corner formed by abutting two or more base materials (refer to FIGS. 2 and 3). In this embodiment, the part to be welded among the parts abutted in this way is referred to as the "welded part". The welded portion 25 may form a joint shape. Examples of the joint shape in this embodiment include lap joints, T-shaped joints, angle joints, bell-mouth joints, and butt joints.

[Molten Zn Coated Steel Sheet] In this embodiment, the base material is composed of molten Zn-based coated steel sheet. The molten Zn-based plated steel sheet usually has coatings on both sides thereof. In this embodiment, the molten Zn-based plated steel sheet may have a coating on at least the surface of the welded portion in the plated steel sheet.

The molten Zn-based coated steel sheet in the present embodiment may be a steel sheet having a molten coating layer containing Zn, but it is preferably a molten coating steel sheet having a coating layer mainly composed of Zn. Examples of molten Zn-based coated steel sheets include molten Zn coated steel sheets, alloyed molten Zn coated steel sheets, molten Zn-Al coated steel sheets, and molten Zn-Al-Mg coated steel sheets.

Among molten Zn coated steel sheets, molten Zn-Al-Mg coated steel sheets usually contain 1.0-22.0% by mass of Al and 0.05-10.0% by mass of Mg, which have excellent corrosion resistance.

The plating layer of the molten Zn-based plated steel sheet may further contain other components than the above. For example, from the viewpoint of suppressing the cause of deterioration in appearance and corrosion resistance, that is _{, the generation and growth of the Zn 11} Mg ₂ series phase, the molten Zn-Al-Mg coated steel sheet may further contain 0.002 to 0.1% by mass Ti; 0.001 to 0.05 mass% of B. In addition, from the viewpoint of suppressing the excessive growth of the Fe-Al alloy layer at the interface between the surface of the plated base plate and the coating layer, in order to improve the adhesion of the coating layer during processing, the molten Zn-Al-Mg coated steel sheet is also It may contain Si in an amount of 2.0% by mass or less.

[Plating adhesion amount] In this embodiment, the plating adhesion amount on one side of the molten Zn-based plated steel sheet is 15 g/m ² or more and 250 g/m ² or less. When the plating adhesion amount becomes small, the corrosion resistance due to the plating layer may be insufficient. When the plating adhesion amount is too large, it may become difficult to suppress the generation of spatter, and it may be difficult to achieve an appearance acceptable for practical use in the welded member. In addition, corrosion that starts at the spatter adhesion portion may easily occur, resulting in insufficient corrosion resistance of the welded member.

[Description of distance D] In this embodiment, the distance D is set according to the diameter R of the welding wire. FIG. 2 is a diagram for explaining the distance D between the front end of the welding wire and the welded part in an example of the arrangement of the base material in the embodiment of the present invention. 3 is a diagram for explaining the distance D between the front end of the welding wire and the welded portion of the base material in another example of the arrangement of the base material in the embodiment of the present invention.

In FIG. 2, the upper board 20a covers the lower board 20b. The upper plate 20a and the lower plate 20b constitute the lap joint. In the example shown in FIG. 2, the welded portion 25 is a part formed by the side edge of the upper plate 20a and the surface of the lower plate 20b along the side edge of the upper plate 20a. In FIG. 3, the upper plate 20a is erected on the upper surface of the lower plate 20b, and the upper plate 20a and the lower plate 20b constitute the T-shaped joint. In the example shown in FIG. 3, the welded portion 25 is a portion formed by the edge of the end surface of the upper plate 20a that abuts against the surface of the plate 20b and the surface of the plate 20b. The distance D is the distance from the front end of the welding wire 10 to the welded part in the axial direction of the welding wire 10.

In this embodiment, the distance D is appropriately set according to the diameter R of the bonding wire. There is no limit to the setting method of the distance D. For example, regarding the distance D, arc welding with a predetermined welding condition including the diameter R of the welding wire is performed in advance, and the front end of the welding wire and the welded part at this time are photographed. And based on the captured image, and according to various phenomena such as the delivery speed of the welding wire and the growth rate of the droplet, the retreat amount of the welding wire (such as the retreat interval and the retreat length, etc.) is determined. In this way, the welding wire can be pulled up to the distance D during the arc welding step.

Alternatively, the distance D can also be set according to a scale or mark arranged by the front end of the welding torch protruding along the axial direction of the welding torch and corresponding to the distance D. For example, based on the scale or mark, the welding wire can be moved back so that the desired distance D is reached during the short-circuit period. Or, regarding the distance D, for example, a device that measures the distance by measuring ultrasonic waves can detect the distance between the front end of the wire and the welded part in a non-contact manner, and short-circuit the wire based on the detection result. Retreat during this period to reach the desired distance D.

In this embodiment, when the distance between the front end of the welding wire and the welded part where the base metal abuts against each other is set to D, and the diameter of the welding wire is set to R, when the short-circuit period transitions to the arc period, Pull the bonding wire to a position that meets 1.25R≦D≦8R. When the distance D is less than 1.25R, short circuits may occur frequently during the arc welding step, and many spatters may be generated due to the deep excavation of the molten pool. When the distance D is greater than 8R, the arc may expand excessively, causing the droplet to grow substantially, so that when the droplet contacts the molten pool (lower), large-sized spatters are generated. From the viewpoint of further suppressing the generation of spatter, the distance D is preferably 2.4R or more, and more preferably 2.9R or more. In addition, from the same viewpoint, the distance D is preferably 7.9R or less, and more preferably 7.1R or less.

[Protective gas] In this embodiment, the arc welding is performed in a protective gas atmosphere. Generally, in gas-shielded arc welding, shielding gas is provided and allowed to flow around the welding wire along the axial direction of the welding wire. The shielding gas system is used to protect the arc and molten pool generated in arc welding to avoid the influence of the surrounding gas. The shielding gas can be appropriately determined according to the material of the base material. For example, in the case of arc welding, it is selected from a gas that is inert with respect to the droplet, the molten pool, the arc, and the neck portion. The shielding gas can be one gas or a mixed gas of two or more gases. Examples of the components of the shielding gas include carbon dioxide, argon, helium, and hydrogen.

In this embodiment, as long as the distance D is within the range of 1.25R or more and 8R or less, the type of shielding gas is not limited. Therefore, in the arc welding of the molten Zn-based plated steel sheet, 100% carbon dioxide gas can also be used. Carbon dioxide gas is generally cheaper than inert gas. In this way, carbon dioxide gas is used as a shielding gas, and good welding quality can be obtained without using more expensive shielding gas, which is advantageous in terms of cost.

On the other hand, in this embodiment, the distance D can be determined within a predetermined range according to the type of shielding gas. For example, when a mixed gas of carbon dioxide gas and argon gas is used as the shielding gas, the distance D can be set to 0.55R or more and 9.2R or less for the same reason as the above-mentioned case of 1.25R or more and 8R or less. The example of the mixed gas includes a mixed gas of 10% by volume of carbon dioxide and 90% by volume of argon. A shielding gas system containing argon is more expensive than carbon dioxide gas. However, by using this mixed gas, the allowable range of the distance D can be further expanded.

When the shielding gas is the above-mentioned mixed gas, from the viewpoint of further suppressing splashing, the distance D is preferably 1.6R or more, and more preferably 2.5R or more. In addition, from the same viewpoint, the distance D is preferably 8.8R or less, and more preferably 7.9R or less.

As described above, in the present embodiment, by appropriately determining the distance D according to the diameter R of the welding wire according to the type of shielding gas, the adhesion amount of spatter can be reduced. The adhering amount of spatter can be appropriately determined according to the purpose of the welded component to be manufactured.

[Wire Bonding] The bonding wire can be appropriately determined according to the material of the base material. For example, from the viewpoint of arc welding of molten zinc Zn-plated steel sheet, it is preferable to use YGW11 or YGW12 as specified by JIS Z3312. The composition of these bonding wires is shown in Table 1 below. The unit is mass %. The rest is iron (Fe) and unavoidable impurities. The unavoidable impurities can be one or more than one, and can also be included in the bonding wire within the range where the effect of the implementation type can be obtained. Examples of the inevitable impurities include Cu, Mo, Al, Ti, Nb, Zr, and N.

[Table 1] C Si Mn P S Ti YGW11 0.07 0.52 1.11 0.017 0.011 0.04 YGW12 0.08 0.60 1.10 0.014 0.010 -

In addition, the welding wires in this embodiment are not limited to the above-mentioned welding wires, and may be other solid welding wires specified in JIS Z3312, or other welding wires.

The diameter R of the welding wire is not limited, but when it is too thin, the generation of the arc during arc welding may become insufficient, resulting in pores in the welding part. In addition, when the diameter of the welding wire is too thick, short circuits may occur frequently due to the growth of droplets during arc welding, and a large amount of spatter may easily occur due to the droplets falling into the molten pool. From the viewpoint of suppressing the generation of pores and spattering, the diameter of the welding wire is preferably 0.8 to 1.6 mm.

[Welding speed] In this embodiment, the welding speed in arc welding is not limited, for example, within the range of 0.1 to 1.0 m/min, it can be set according to various other welding conditions. There are no restrictions on other welding conditions during the arc period, such as the wire delivery speed, and can be set appropriately.

[Other steps] In this embodiment, within the scope that the effects of this embodiment can be obtained, other steps besides the arc welding may be further included. For example, it may further include the step of adjusting the supply of welding current and cutting off the constricted portion during the short-circuit period.

[Welding components] The welding member in this embodiment is a welding member manufactured by the above-mentioned manufacturing method. In this embodiment, the "welded member" refers to a member including a portion welded through the arc welding step. The welded part is also called "welded bead".

[Number of Spatters Adhering] According to the manufacturing method of the welded member, it is possible to weld molten Zn-based plated steel sheets to each other while suppressing the generation of spatter. For example, among the welding components of this embodiment, the number of spatter adhesion per unit area in the area adjacent to the weld bead in the welding component (hereinafter also referred to as "adjacent area") can be 0.5/cm ² the following.

The adhesion amount of spatter per unit area in adjacent areas can be determined according to the use of the welding member. For example, from the viewpoint of making the welded member substantially exhibit various characteristics including the corrosion resistance of the molten zinc-based Zn-plated steel sheet, it is appropriate that the ^{number of spatter adhesions is 0.5 pieces/cm 2 or less.} It is also possible to set a smaller number of spatter adhesion (for example, 0.4 pieces/cm ² or less) for welded components that require higher corrosion resistance and better appearance.

In addition, the shape and size of the adjacent area for calculating the number of spatter adhesion per unit area can be appropriately set to appropriately calculate the number of spatter adhesion per unit area. For example, the adjacent area may be an area where the length in the extending direction of the solder bead may be 100 mm, and the length in the direction perpendicular to the extending direction is 50 mm. In this case, in order to make the adhering number of splashes per unit area in the adjacent area 0.5 pieces/cm ² or less, it is sufficient that the adhering number of splashes in the adjacent area is 25 or less. In addition, the adhesion amount of the spatter only needs to be a numerical value that is a representative value of the adhesion amount of the spatter in the welding member. For example, the amount of spatter attached may be a measurement value in an arbitrarily set area of the welding member, or may be an average value of measurement values measured in a plurality of arbitrarily set areas.

[sort out] It is obvious from the above description that in this embodiment, when the diameter of the welding wire is set to R, during the transition from the short-circuit period to the arc period, the tip of the welding wire and the welded wire will be welded according to the type of shielding gas. The distance D between the parts is controlled within a predetermined range of 0.55R or more and 9.2R or less. This can appropriately suppress the occurrence of spatter during arc welding, and can obtain a welded component with a sufficiently small amount of spatter adhesion.

The manufacturing method of the welding component of this embodiment includes controlling the delivery of the welding wire so that the front end of the welding wire advances toward the welded part during the arc period, and the welded part penetrates a plurality of base materials. The two molten Zn-based plated steel plates are formed by abutting each other, and the front end of the welding wire is retracted from the welded part during the short-circuit period, and the base materials are arc-welded to each other in a protective gas atmosphere at the same time. In addition, in the molten Zn-based plated steel sheet, the plating adhesion amount on the surface forming the welded portion is 15 g/m ² or more and 250 g/m ² or less. In addition, when the distance between the front end of the welding wire and the welded portion is set to D, and the diameter of the welding wire is R, when the short-circuit period transitions to the arc period, the The welding wire is pulled to a position conforming to 1.25R≦D≦8R. According to this configuration, it is possible to reduce the spatter caused by the arc welding in the welded component manufactured by the arc welding of the molten Zn-based plated steel sheet regardless of the type of shielding gas.

In this embodiment, from the viewpoint of reducing the manufacturing cost of the welded component, it is more effective to use 100% by volume of carbon dioxide gas as the shielding gas.

In addition, the manufacturing method of the welding component of this embodiment includes controlling the delivery of the welding wire so that the front end of the welding wire advances toward the welded part during the arc period, and the welded part penetrates as the base material A plurality of molten Zn-based plated steel sheets are formed by contacting each other, and the front end of the welding wire is retracted from the welded part during the short-circuit period, and the base materials are arc welded to each other in a protective gas atmosphere. step. In addition, a mixed gas of carbon dioxide gas and argon gas is used as the shielding gas. In the molten Zn-based plated steel sheet, the plating adhesion amount on the surface forming the welded part is 15g/m ² or more and 250g /m ² or less. In addition, when the distance between the front end of the welding wire and the welded portion is set to D, and the diameter of the welding wire is R, when the short-circuit period transitions to the arc period, the The welding wire is pulled up to a position conforming to 0.55R≦D≦9.2R. According to this configuration, it is possible to enlarge the manufacturing boundary with respect to the distance D in the arc welding of the molten Zn-based plated steel sheet. Therefore, it is more effective from the viewpoint of manufacturing welding components that require stricter welding conditions.

The welding component of this embodiment is a welding component manufactured by the method of manufacturing a welding component of this embodiment. According to this configuration, it is possible to reduce the spatter caused by the arc welding in the welded component manufactured by arc welding the molten Zn-based plated steel sheet regardless of the type of shielding gas.

In the present embodiment, from the viewpoint of making the welded component substantially exhibit the various characteristics of the molten zinc-Zn-based plated steel sheet as the base material, each unit in the area adjacent to the weld bead in the welded component It is more effective that the adhesion number of splashes in the area is 0.5 pieces/cm ² or less.

The present invention is not limited to the above-mentioned implementation types, and various changes can be made within the scope shown in the claims. The implementation pattern obtained by appropriately combining the technical means respectively disclosed in the different implementation patterns is also included in the technical scope of the present invention.

[Example] The following description is made for an embodiment of the present invention.

[Prepare base material] The four types of molten Zn-based plated steel sheets shown in Table 2 were prepared. Hereinafter, they are also referred to as steel plates 1 to 4. In Table 2, the balance of the composition of the coating is zinc (Zn). The upper plate and the lower plate are prepared from each of the steel plates 1 to 4 as base materials. Regarding the size of the upper plate, the plate thickness is 3.2 mm, the plate width is 50 mm, and the length is 150 mm. Regarding the size of the lower plate, the plate thickness is 3.2 mm, the plate width is 100 mm, and the length is 150 mm. The "Ap" in the following table indicates the amount of coating adhesion on one side of the molten Zn-based coated steel sheet.

[Table 2] Steel plate No. species Coating Ap(g/m ² ) composition Quantity (mass%) 1 Fused Zn Coated Steel Sheet Al 0.2 250, 300 2 Alloyed molten Zn coated steel sheet Fe 10 60 3 Molten Zn-Al coated steel sheet Al 1～55 100～300 Si 0～2 4 Molten Zn-Al-Mg coated steel sheet Al 1～22 15～300 Mg 0.05～10.0 Ti 0.002～0.1 B 0.001～0.05 Si 0～2.0 Fe 0～2.5

[Production Example 1 of Welded Components] (1) Arc welding Use steel plate 4 to form lap fillet weld joints and perform arc welding. Fig. 4 is a diagram schematically showing the structure of the welding member formed in the embodiment. Fig. 4 shows the state of the welding member viewed from above. In more detail, the side edge 201b of the lower board 20b and the side edge 201a of the upper board 20a overlap each other. Regarding the welding member, the part formed by the other side edge 202a of the upper plate 20a and the surface of the lower plate 20b along the other side edge 20a of the upper plate 20a is the part to be welded, that is, to be welded unit.

From one end of the welded portion, arc welding is performed along the length direction of the lower plate 20b to the other end. The arc welding system is performed by tilting the welding torch to the lower plate 20b side, and at a certain distance from the welded part, and scanning from one end of the welded part to the other end. More specifically, when viewed along the length of the lower plate 20b, the welding torch is tilted toward the lower plate 20b, so that as shown in FIG. 2, the angle formed by the axis of the welding line and the surface of the lower plate 20b is an acute angle (For example, about 45°), and arc welding is performed at the same time.

In addition, the welding torch supports the welding wire so that the welding wire can advance and retreat to the welded part. The bonding wire is also used as an electrode. The welding torch also has a gas supply device, which supplies shielding gas around the welding wire along the axial direction of the welding wire. In addition, during arc welding, the welding torch is kept at a certain distance from the welded part and at the same time is movably supported.

The bonding wire is a wire with a diameter (R) of 1.2mm, and the bonding wire specified as YGW12 in JIS Z3312 is used. The conditions of arc welding are: welding current of 180A, welding voltage of 18.8V, and welding speed of 0.4m/min. The welding speed is the speed at which the welding torch moves along the welded part. In addition, 100% carbon dioxide gas is used as a protective gas. In addition, the weld bead length is 150 mm, and the overlap length between the base materials, that is, the overlap portion is 50 mm.

During the arc period, the welding wire is delivered at a predetermined speed so that the front end of the welding wire approaches the welded part. In addition, during the short-circuit period, the bonding wire is retracted so that the front end of the bonding wire is separated from the welded part. The amount of retreat of the welding wire at this time is such an amount that the distance D from the front end of the welding wire to the welded portion at the beginning of the next arc period is 1.5 mm.

The retreat of the bonding wire is controlled in the following manner. First, arc welding is performed in advance in accordance with the desired (for example, the above-mentioned) welding conditions. At this time, a high-speed camera was used to photograph the front end of the welding wire and the welded part during arc welding. The retreat amount of the welding wire is obtained according to the captured image, that is, the distance D from the front end of the welding wire to the welded part when the arc period restarts is the desired distance of 1.5 mm.

Under the above-mentioned welding conditions, the welding torch is moved from one end of the welded part to the other end, and arc welding is performed to form the weld bead 21 as shown in FIG. 4. In this way, the welded member 1 is manufactured.

(2) Evaluation of welded components The amount of spatter adhering to the welding member 1 is measured. Spatter refers to the tiny particles of molten metal scattered during arc welding. Since the welding torch inclines to the lower plate 20b side during arc welding, spatters generally adhere to the surface of the lower plate 20b. Therefore, on the surface of the lower plate 20b of the welding member 1, an area 22 of 50 mm long (short side direction) and 100 mm wide (long side direction) in contact with one side edge of the solder ball 21 is arbitrarily set, and the attachment area is calculated The number of splashes of 22. The number of spatters adhering to the area 22 of the welding member 1 was 19 pieces. Table 3 shows the conditions and evaluation results of arc welding in the welded component 1. In addition, "Ns" in the table indicates the number of splashes.

[table 3]

[Production Examples 2-12 of Welded Components] Except that the distance D was changed to the numerical value described in Table 3, the welded members 2 to 12 were manufactured and evaluated in the same manner as in Manufacturing Example 1 of the welded member. Table 3 shows the conditions and evaluation results of arc welding among the welded members 2-12.

It is obvious from Table 3 that in the welding components 1-7 whose distance D from the front end of the wire pulled up during the short-circuit period to the welded part is in the range of 1.25R to 8R, the spatter in the area 22 The number of attachments is less than 20, and there is no problem from the point of view of practical application. Therefore, it can be seen that according to the present invention, a welded component by arc welding that suppresses the occurrence of spatter and has an excellent appearance of the welded portion can be obtained.

On the other hand, among the welded members 8 to 12 whose distance D is outside the range of the present invention, spatter is notably generated. Therefore, it can be seen that when a shielding gas of 100% carbon dioxide gas is used, a welded member having an excellent welded part appearance cannot be obtained outside the above-mentioned range.

[Production Examples 13-27 of Welded Components] Except that a mixed gas of argon and carbon dioxide was used instead of 100% carbon dioxide as the type of shielding gas, and the distance D was changed to the value shown in Table 4, the manufacturing was carried out in the same manner as in Manufacturing Example 1 of the welded member. , Evaluation of welding components 13-27. In addition, the content of carbon dioxide in the mixed gas is 10% by volume, and the remainder is argon. Table 4 shows the conditions and evaluation results of arc welding among the welded members 13-27.

[Table 4]

It can be clearly seen from Table 4 that when the mixed gas of argon and carbon dioxide is used as the shielding gas, the number of spatters attached to the area 22 of the welded components 14-23 with a distance D of 0.55R～9.20R is 25 Below. In contrast, among the welded members 13 and 24 to 27 whose distance D is outside the above range, spatters are significantly adhered.

[Manufacturing Examples of Welded Components 28 to 39] The welded member 28 was manufactured and evaluated in the same manner as in Manufacturing Example 1, except that the steel plate 1 having the single-sided plating adhesion amount described in Table 5 was used instead of the steel plate 4 and the distance D was changed to 2.0 mm. In addition, except that the steel plate 2 was used instead of the steel plate 4 and the distance D was changed to 4.0 mm, the welded member 29 was manufactured and evaluated in the same manner as in the manufacturing example 1 of the welded member. In addition, in addition to using the steel plate 3 having the plating composition and the single-sided plating adhesion amount described in Table 5 instead of the steel plate 4, and changing the distance D to the value described in Table 5, it is compatible with the manufacture of welded components. In the same manner as in Example 1, the welded members 30 to 32 were separately manufactured and evaluated. In addition, except that the steel plate 4 having the plating composition and the single-sided plating adhesion amount described in Table 5 was used separately, and the distance D was changed to the value described in Table 5, it was the same as the manufacturing example 1 of the welded member. According to the method, the welded members 33 to 39 were separately manufactured and evaluated. Table 5 shows the conditions and evaluation results of arc welding among the welded members 28 to 39.

[table 5]

It is obvious from Table 5 that 100% carbon dioxide gas is used as the shielding gas in all the welding components 28 to 39, and the distance D is in the range of 1.25R to 8R. In addition, among all the welding components 28 to 39, the number of spatters attached to the area 22 is less than 20.

In particular, among the welded members 28, 29, 30-32 and 33-39, molten Zn-coated steel sheets with different coating compositions are used as base materials. Therefore, it can be seen that in the present invention, in the arc welding of the molten Zn-plated steel sheet, a welded member that suppresses the generation of spatter and has an excellent welded part appearance can be obtained.

Also known, for example, known from the welding members 36 to 39 can be significantly plated base material to 250g / m ^2, a thickness from a thin coating weight of 15g / m ² base material plated Jieke obtained splashes is suppressed, and Welded components of molten Zn-plated steel sheet with excellent appearance of welded joints.

[Manufacturing Examples of Welded Components 40 to 53] Except that the steel plate 4 having the plating composition and the single-sided plating adhesion amount described in Table 6 was used, and the distance D was changed to the value described in Table 6, it was manufactured and evaluated in the same manner as in Manufacturing Example 1 of the welded member Welding member 40. In addition, in addition to using the steel plate 4 having the plating composition described in Table 6 and the adhesion of one-sided plating, and changing the diameter R and the distance D of the welding wire to the values described in Table 6, it is compatible with the manufacture of welded components. In the same manner as in Example 1, the welded members 41 to 50 were separately manufactured and evaluated. In addition, instead of steel plate 4, steel plate 1 having the single-sided coating adhesion amount described in Table 6 was used, and the distance D was changed to 2.0 mm, and the welded assembly was manufactured and evaluated in the same manner as in Manufacturing Example 1 of welded member. 51. In addition, instead of steel plate 4, steel plate 3 having the plating composition described in Table 6 and the amount of single-sided plating adhesion was used, and the distance D was changed to a value other than the value listed in Table 5 to match the manufacturing example 1 of the welded member. In the same manner, the welded members 52 and 53 were separately manufactured and evaluated. Table 6 shows the conditions and evaluation results of arc welding in the welding members 40 to 53.

[Table 6]

It can be seen from Table 6 that among the welded components 40-50 whose distance D is in the range of 1.25R-8R, the number of spatters attached to the region 22 is less than 20.

Especially from the welding components 40, 41～44 and 45～50, when the distance D is in the range of 1.25R～8R, even if the shielding gas is 100% carbon dioxide gas, at least the diameter R of the welding wire is 0.8～1.6mm Within the range of, the number of splashes attached to the area 22 is less than 20.

In contrast, even if the distance D is within the above-mentioned range, among ^{the welded members 51 to 53 with a single-sided plating adhesion greater than 250g/m 2} of the base material, there is a significant amount of spatter or spatter that will cause The amount of practical application problems. It is believed that this is due to the significant generation of Zn vapor in the welded part during arc welding.

Especially by comparing the welding member 28 and the welding member 51; or comparing the welding member 32 and the welding member 53, it can be seen that when the single-sided plating adhesion amount in the base material is greater than 250 g/m ² , it can suppress the generation of spatter It is not sufficient in practical applications.

[Production Examples 54 to 69 of Welded Components] Using a steel sheet having the plating composition and single-sided plating adhesion amount described in Table 7, and except for changing the distance D to the value described in Table 7, the welded members were separately manufactured and evaluated in the same manner as in Manufacturing Example 1. 54～59. In addition, using the steel plate with the plating composition and the single-sided plating adhesion amount described in Table 7, the diameter R and the distance D of the welding wire were changed to the values described in Table 7, and the same as the manufacturing example 1 of the welded member According to the method, the welded members 60 to 69 were separately manufactured and evaluated. Table 7 shows the conditions and evaluation results of arc welding among the welding members 54 to 69.

[Table 7]

It can be clearly seen from Table 7 that among the welded components 54-69, regardless of whether the distance D is within the scope of the present invention, the single-sided plating adhesion amount in the base material is greater than 250 g/m ² , and the suppression of splashing is It is not sufficient in practical applications.

10: Welding wire 20: base material 20a: upper board 20b: Lower board 21: Weld Bead 22: area 25: Welded part 30: droplet 40: Arc 50: molten pool 60: shrink neck 100: Initial state during short circuit 200: terminal state during short circuit 201a: One side edge of upper board 20a 201b: One side edge of the lower board 20b 202a: The other side edge of the upper plate 20a 300: Initial state during arc 400: End state during arc A: Arc width D: distance R: (welding wire) diameter

[Fig. 1] is a diagram schematically showing an example of the flow of the arc welding method in an embodiment of the present invention. [Fig. 2] is a diagram for explaining the distance D between the front end of the welding wire and the welded part in an example of the arrangement of the base material in the embodiment of the present invention. [Fig. 3] is a diagram for explaining the distance D between the front end of the welding wire and the welded portion of the base material in another example of the arrangement of the base material in the embodiment of the present invention. [Fig. 4] is a diagram schematically showing the structure of the welding member formed in the embodiment of the present invention.

10: Welding wire

20: base material

30: droplet

40: Arc

50: molten pool

60: shrink neck

100: Initial state during short circuit

200: terminal state during short circuit

300: Initial state during arc

400: End state during arc

A: Arc width

D: distance

R: (welding wire) diameter

Claims (5)

A method of manufacturing a welding component, which includes controlling the delivery of the welding wire so that the front end of the welding wire advances toward the welded part during the arc period, and the welded part penetrates a plurality of molten Zn as a base material It is a step in which the plated steel plates abut against each other, and the front end of the welding wire retreats from the welded part during the short-circuit period, and at the same time arc welding the base materials to each other in a protective gas atmosphere, wherein In the molten Zn-based plated steel sheet, the amount of plating adhesion on the surface forming the welded portion is 15g/m ² or more and 250g/m ² or less, when the front end of the welding line is set to be welded When the distance between the parts is D and the diameter of the welding wire is R, when the short-circuit period transitions to the arc period, the welding wire is pulled to a position that meets 1.25R≦D≦8R . The method for manufacturing a welded component according to claim 1, wherein 100% by volume of carbon dioxide gas is used as the shielding gas. A method of manufacturing a welding component, which includes controlling the delivery of the welding wire so that the front end of the welding wire advances toward the welded part during the arc period, and the welded part penetrates a plurality of molten Zn as a base material It is formed by abutting the plated steel plates, and the front end of the welding wire is retracted from the welded part during the short-circuit period, and at the same time, the step of arc welding the base materials to each other in a protective gas atmosphere, wherein A mixed gas of carbon dioxide gas and argon gas is used as the shielding gas. In the molten Zn-based plated steel sheet, the amount of coating deposited on the surface forming the welded part is 15g/m ² or more and 250g/m ² or less, when the distance between the front end of the welding wire and the welded part is set to D, and the diameter of the welding wire is R, when the short-circuit period transitions to the arc period, the The bonding wire is pulled up to a position conforming to 0.55R≦D≦9.2R. A welding component manufactured by the manufacturing method of the welding component according to any one of claims 1 to 3. The welding member according to claim 4, wherein the adhesion number of spatter per unit area in a region adjacent to the weld bead in the welding member is 0.5 pieces/cm ² or less.

Images