31results about "Weld torches cleaning" patented technology

The invention discloses an intelligent robot for body-in-white welding, and relates to the technical field of welding robots, the intelligent robot comprises a base, a robot joint arm and a welding head, the robot joint arm is installed on the base, the welding head is installed at the end, away from the base, of the robot joint arm, and the upper end of the welding head fixedly communicates with a wire feeding pipe; the wire feeder is installed on the upper portion of the base, the end, away from the welding head, of the wire feeding pipe is installed on the wire feeder, the inner scraping ring and the outer scraping ring can clean the inner surface and the outer surface of the welding head, blockages such as splash welding slag generated by welding on the inner surface and the outer surface of a nozzle of the welding head can be scraped away, smooth circulation of protective gas is guaranteed, and a good welding environment is maintained. The conditions that if welding wire residues remain on the inner wall of the contact tube, friction can be increased in the follow-up welding wire conveying process, abrasion occurs, and the hole diameter becomes large are avoided, impurities prone to abrasion can be removed in time through cleaning, components can be kept in a good initial state, and the normal service life of a welding head is prolonged.

The invention provides a submerged-arc welding device for a special-shaped part, and relates to the technical field of submerged-arc welding equipment, the submerged-arc welding device comprises a submerged-arc welding gun part, and a pressing control part is mounted on the submerged-arc welding gun part; the downward pressing control piece is used for adjusting downward pressing force; a welding path rolling part is mounted on the downward pressing control part; the welding path rolling part is used for rolling a welding path; a bottoming fitting piece is mounted on the submerged-arc welding gun part; the bottoming fitting piece is positioned below the pressing control piece; a bottoming detection piece is mounted on the bottoming fitting piece; the bottoming detection piece is used for detecting the bottoming width; the device can be used for detecting the initial backing uniformity of carbon dioxide arc welding, the advancing speed of a welding wire can be conveniently controlled for compensation, the uniformity of a welding path is improved, and the problems that an existing special-shaped part submerged-arc welding device cannot conveniently conduct leveling adjustment work on special-shaped welding seams and cannot automatically test backing parameters of carbon dioxide arc welding are solved.

To provide a multiaxial 3D printing device for metal structural components and an arc-based additive manufacturing method.SOLUTION: Based on a multiaxial coordinated printing mode of a robot arm device, a movable guide rail device, and a positioner device, expansion of a six-axis robot arm enables printing in a robot arm's free posture and moving a guide rail enables movable printing following an axis along the guide rail, an open motion space of the 3D printing robot is enlarged, a two-axis positioner allows achieving multiaxial 3D printing without support for complex metal structural components, reducing material costs, and simplifying post-processing. Simultaneously, linkage linear interpolation through a world coordinate system allows effective controlling printing accuracy and print accuracy and large-format dimensions and further achieving multiaxial 3D printing for large and complex metal structural components.SELECTED DRAWING: Figure 1

The invention provides a robot welding machine, and belongs to the technical field of welding robots, the robot welding machine comprises a robot body, and further comprises a shunting heat conduction assembly and a supporting cleaning assembly; protective gas forms focused gas flow through shunting and secondary shunting, and gas flow sprayed by the cooling channel and the permeable plate is uniformly mixed under the guidance of a conical space at the front end of the nozzle, so that the concentration distribution of the protective gas above a molten pool is consistent, and the welding seam quality is improved; trace moisture in the protective gas is treated under the action of centrifugal force of the turbofan, and water vapor generated by falling and evaporation of water drops is guided to the periphery of the gas hood and cannot intrude into a molten pool area; the heat conduction cylinder rotates to enable airflow to sweep the whole surface of the contact tube, local overheating and heat dissipation dead angles are avoided, and the normal working temperature of the contact tube is guaranteed; the airflow can clean splashing particles attached to the outer side of the contact tube and the inner wall of the nozzle, the scraping arm can be tightly attached to the cleaning face in the rotating process and can abut against the contact tube, the deformation possibility of the contact tube is reduced, and the continuity and stability of the welding process are guaranteed.

The invention discloses a welding device. The welding device comprises a frame body; the first moving module is mounted on the frame body and can move in the first horizontal direction; the second moving module is installed on the first moving module and can move in the second horizontal direction perpendicular to the first horizontal direction; the third moving module is mounted on the second moving module and can move in the vertical direction perpendicular to the first horizontal direction and the second horizontal direction; and the welding module is installed on the third moving module and can move along with the first moving module, the second moving module and the third moving module, the welding module is suspended outside the frame body, and the first moving module is arranged in the inner cavity of the frame body so as to reduce the distance between the welding module and the frame body. Therefore, the welding device has good rigidity and stability, and the welding precision can be improved. In addition, the welding flux device adopts modular design, the moving structure is simplified, the control difficulty is reduced, and the welding flux device can be suitable for various production lines.

A welding spatter protection device has a support structure, a movable structure delimiting a first internal cavity by internal side walls and movable by a first actuator between a lowered position, in which the first internal cavity is placed astride a welding zone, and a raised position, in which the first internal cavity is moved away from the welding zone, and a cleaning system having a scraper. Two second internal side walls interconnect two first internal side walls defining two concentric cylindrical surfaces. The scraper is connected to the movable structure by a support arm actuatable by a second actuator. Circumferential ends of the concentric cylindrical surfaces at an inlet mouth and at an internal stop position are radially aligned so that the scraper is always in contact with the concentric cylindrical surfaces, oriented so that a radially outermost cylindrical surface extends beyond the bottom wall, defining a shielding appendage.

To provide a welding torch which can regulate rotation of an outer cylindrical body provided on a torch barrel part around the torch barrel part with simple configuration, and a retaining ring.SOLUTION: A welding torch comprises: a torch barrel part to a tip side of which a tip member is attached; a cylindrical fitting body which is inserted through the torch barrel part, and of which axial movement to a tip side is regulated by a regulation part provided on the torch barrel part; an outer cylindrical body which is fastened to the fitting body on an axial tip side with respect to the regulation part, whereby axial movement of which is regulated in a state of being externally packaged in the torch barrel part; and a retaining ring is inserted through the torch barrel part so as to regulate rotation of the outer cylindrical body with respect to the torch barrel part.SELECTED DRAWING: Figure 4

The present invention discloses a welding device. The welding device comprises: a frame body (4); a first movable module (1) installed on the frame body (4) and movable in a first horizontal direction; a second movable module (2) installed on the first movable module (1) and movable in a second horizontal direction perpendicular to the first horizontal direction; a third movable module (3) installed on the second movable module (2) and movable in a vertical direction perpendicular to the first and second horizontal directions; and a welding module (5) installed on the third movable module (3) and movable together with the first, second, and third movable modules (1, 2, 3).The welding module (5) is suspended outside the frame body (4), and the first movable module (1) is located in an inner chamber (40) of the frame body (4) to reduce the distance between the welding module (5) and the frame body (4). Therefore, the welding device of the present invention exhibits good rigidity and stability, which in turn improves welding accuracy. Furthermore, the welding device of the present invention uses a modular design, which simplifies the movable structure and reduces the difficulties of control, making the welding device suitable for various production lines.

The invention relates to a welding spatter protection device, a welding machine provided with such a welding spatter protection device, a method for shielding a welding spatter in such a welding machine, the welding spatter protection device comprising:-a support structure; -a movable structure defining a first inner protective cavity by means of a plurality of inner side walls and movable relative to the support structure by means of a first actuator between a lowered position, in use, in which the first inner cavity is placed across the weld zone, and a raised position, in use, in which the first inner cavity is placed across the weld zone. The first internal cavity moves away from the welding area; -a cleaning system for cleaning an inner side wall of said first inner cavity from welding spatter, the cleaning system comprising a wiper.

The invention discloses a load double-wire-feeding-mechanism device of a dioxo welding machine and an operation method. The load double-wire-feeding-mechanism device comprises a control cabinet, a dioxo welding machine body arranged in a frame, two wire feeding mechanisms and a ground wire mechanism arranged at the grounding end of the dioxo welding machine body. The gas circuit of the dioxo welding machine main body is connected with the two welding gun mechanisms, and a welding power supply module and a gas flow control module are arranged in the dioxo welding machine main body and used for controlling the welding gun mechanisms; the welding power supply module is used for providing welding electric energy; the gas flow control module is used for controlling the flow of carbon dioxide protective gas; a control circuit module is arranged in the control cabinet and electrically connected with the wire feeding mechanism, the welding power source module and the gas flow controller, and all the parts are cooperatively controlled according to preset welding parameters and actual welding conditions. The action waste of operators is reduced, the dioxo welding machine body, the wire feeding mechanisms, the relay and the like are adopted to form a loop, the effect that one dioxo welding machine body loads two wire feeding mechanisms is achieved, and the operability and efficiency are improved.

The present application relates to a kind of self-cleaning welding device for gym equipment production, it is related to welding technical field, including welding gun, wire feeding system, dust collection device, several pipe plugging devices, shielding gas pipe, waste gas exhaust pipe and tracking device, the dust collection device is installed at the end of welding gun, the wire feeding system is installed at the bottom of welding gun, the wire feeding system is inserted into the inside of dust collection device, the shielding gas pipe and waste gas exhaust pipe are all inserted into dust collection device, each pipe plugging device has the sealing end of opening and closing and pipe plugging device is communicated with shielding gas pipe, the tracking device is installed at the bottom of welding gun and tracking device is located in dust collection device, with self-cleaning function.

The invention discloses an automobile part welding device with an auxiliary function and a welding method of the automobile part welding device, relates to the technical field of automobile part welding devices, and aims to solve the problems that a welding gun of an existing automobile part welding device is prone to accumulation of impurities such as splashes, oxides, grease and dust in the using process, and the welding efficiency is high. The problems that impurities possibly enter a molten pool during welding, air holes and inclusions are generated in a welding seam, the strength and the sealing performance of the welding seam are affected, and pollution of a welding gun nozzle, a contact tube and other components can affect the stability of an electric arc are solved. A welding robot is fixedly mounted above the welding robot mounting seat, a welding mechanism is mounted at the upper end of the welding robot, a dust hood is arranged at the outer end of the welding mechanism, a welding gun cleaning mechanism is mounted on the rear side in the dust hood, and a grinding mechanism is fixedly mounted on one side in the dust hood.

The application discloses an intelligent robot for a body-in-white welding, and relates to the technical field of welding robots, which comprises a base, a robot joint arm and a welding head, the robot joint arm is installed on the base, the welding head is installed on the end of the robot joint arm far from the base, the upper end of the welding head is fixedly connected with a wire feeding pipe, a wire feeder is installed on the upper portion of the base, the end of the wire feeding pipe far from the welding head is installed with the wire feeder, and the inner scraping ring and the outer scraping ring can clean the inner and outer surfaces of the welding head, so that the blockages on the inner and outer surfaces of the nozzle of the welding head, such as the spatters and the welding slag generated in the welding, can be scraped off, the smooth flow of the protective gas is ensured, a good welding environment is maintained, if there are welding wire residues remaining on the inner wall of the conductive nozzle, the friction will be increased when the subsequent welding wire is conveyed, and the wear, the increase of the aperture and the like will occur, the impurities which are easy to cause the wear can be timely removed through the cleaning, the parts can be kept in a good initial state, and the normal use period of the welding head is prolonged.

The present invention discloses a welding device for automotive parts with auxiliary functions and a welding method thereof, which relates to the technical field of welding devices for automotive parts. To solve the problem that impurities such as spatter, oxides, grease, and dust are likely to accumulate on the welding torch during the use of the existing welding device for automotive parts, and these impurities may enter the molten pool during welding, resulting in pores and inclusions in the weld seam, thereby affecting the strength and sealing performance of the weld seam, and the contamination of components such as the welding torch nozzle and the contact tip will affect the arc stability. A welding robot mounting seat is slidably arranged above the positioning seat, a welding robot is fixedly installed above the welding robot mounting seat, a welding mechanism is installed at the upper end of the welding robot, a dust suction hood is arranged at the outer end of the welding mechanism, a welding torch cleaning mechanism is installed at the rear side inside the dust suction hood, and a grinding mechanism is fixedly installed on one side inside the dust suction hood.

To provide a multiaxial 3D printing device for metal structural components and an arc-based additive manufacturing method.SOLUTION: Based on a multiaxial coordinated printing mode of a robot arm device, a movable guide rail device, and a positioner device, expansion of a six-axis robot arm enables printing in a robot arm's free posture and moving a guide rail enables movable printing following an axis along the guide rail, an open motion space of the 3D printing robot is enlarged, a two-axis positioner allows achieving multiaxial 3D printing without support for complex metal structural components, reducing material costs, and simplifying post-processing. Simultaneously, linkage linear interpolation through a world coordinate system allows effective controlling printing accuracy and print accuracy and large-format dimensions and further achieving multiaxial 3D printing for large and complex metal structural components.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of welding, and discloses contact tube replacement equipment which comprises a machine shell, a contact tube dismounting and feeding device and a nozzle dismounting and cleaning mechanism, the machine shell comprises a lower mounting plate and an upper mounting plate, and the upper mounting plate and the lower mounting plate are arranged in parallel at an interval; the nozzle dismounting and cleaning mechanism is used for dismounting a nozzle of the welding gun, cleaning the nozzle and remounting the nozzle on the welding gun; a contact tube dismounting mechanism and a contact tube feeding mechanism in the contact tube dismounting and feeding device are arranged up and down, and the contact tube dismounting mechanism can dismount a contact tube on a welding gun and mount a new contact tube supplied by the contact tube feeding mechanism on the welding gun; therefore, the old contact tube can be disassembled and the new contact tube can be assembled at the same station, the replacement operation efficiency can be improved, the number of operation mechanisms is reduced, and the whole machine is more compact in structure and smaller in occupied space.

The present invention provides a robot welding machine, which belongs to the technical field of welding robots. The invention includes a robot body and also includes: a diversion heat conduction component and a support cleaning component; the shielding gas forms a focused airflow through diversion and secondary diversion, and the airflow ejected from the cooling channel and the air permeable plate is evenly mixed under the guidance of the conical space at the front end of the nozzle, so that the concentration distribution of the shielding gas above the molten pool is uniform, thereby improving the quality of the weld; the trace moisture in the shielding gas is processed under the action of the centrifugal force of the turbofan, and the water vapor generated by the evaporation of water droplets is guided to the periphery of the gas hood and will not invade the molten pool area; the heat conduction tube rotates to make the airflow sweep over the entire surface of the conductive nozzle, avoiding local overheating and heat dissipation dead corners, and ensuring the normal working temperature of the conductive nozzle; the airflow can clean the splashing particles adhered to the outside of the conductive nozzle and the inner wall of the nozzle, and the scraper arm can be close to the cleaning surface and kept close to the conductive nozzle during rotation, thereby reducing the possibility of deformation of the conductive nozzle and ensuring the continuity and stability of the welding process.

The welding device comprises a high-pressure cabin, a welding platform is arranged in the high-pressure cabin, the high-pressure cabin is externally connected with a gas tank, and the aluminum-based composite material is welded through environment pressure, mechanical movement and automatic temperature control under the inert atmosphere and the pressure environment of 0.5 MPa-1. 0 MPa. High-quality welding of the aluminum-based composite material under the inert gas and positive pressure environment is achieved, and the solidification part of a welding pool is forcibly cooled, so that the solidification part is rapidly cooled and solidified, the microstructure is refined, and the density of a welding seam is improved; the high-quality welding method for aluminum-based composite material products in various to-be-welded form areas is achieved, and the method has the advantages of being high in welding density, uniform and solidified in weld joint structure, wide in welding application range and low in stress deformation.

A welding gun is provided with: a welding gun body section to which a nozzle member is attached to the tip side; a cylindrical mounting body into which the welding gun body part is inserted and which is restricted from moving in the axial direction toward the tip side by a restriction part provided on the welding gun body part; an outer cylinder which is fastened to the mounting body at a position closer to the axial front end side than the restricting part so as to restrict the axial movement of the outer cylinder when the outer cylinder is externally mounted on the gun body part of the welding gun; and a retainer ring into which the welding gun body section is inserted so as to restrict the rotation of the outer cylinder body with respect to the welding gun body section.

A system and method for servicing a welding torch is provided. The system includes a gripping module for holding and releasing a component of the welding torch, the gripping module is movable along an axis of the gripping module and rotatable about the axis; and a control system for providing a degree of freedom in a movement of the gripping module to control or reduce a force exerted between mating components of the welding torch.

The present invention relates to a spot welding device, and particularly to a spot welding device for manufacturing linear motors. A spot welding device for manufacturing linear motors is provided, which can shield the welding object to prevent the sparks generated during spot welding from splashing everywhere and improve the operation safety. The present invention is achieved through the following technical means: A spot welding device for manufacturing linear motors includes a spot welder, a spot welding head, a fixing plate, etc. A fixing plate is provided on the upper side of the front part of the spot welder, and a spot welding head for performing spot welding work is provided on the fixing plate, and the spot welding head is connected to the spot welder. The front side and the top of the linear motor can be covered by a partition plate and a cover plate, so that the arc and sparks generated during the electric welding work can be blocked to prevent splashing everywhere, and at the same time, it can prevent dust from splashing out and excessive noise from being generated during electric welding.

The invention relates to a gun cleaning device for a welding gun. The gun cleaning device comprises a rack, a turntable mechanism, a lifting mechanism, a dismounting mechanism, a nozzle cleaning mechanism and a contact tube cleaning mechanism. The rotating disc mechanism comprises a fixing base and a rotating disc, the fixing base is arranged on the rack in a lifting motion mode through a lifting mechanism, and the rotating disc is rotatably connected with the fixing base. And the dismounting mechanism can correspond to the welding gun up and down under the driving of the turntable, and is used for dismounting or mounting a nozzle of the welding gun. The disassembling and assembling mechanism can correspond to the nozzle cleaning mechanism up and down under driving of the rotating disc, and the nozzle cleaning mechanism is used for cleaning the nozzles on the disassembling and assembling mechanism. And the contact tube cleaning mechanism can correspond to the welding gun up and down under the driving of the turntable, and is used for cleaning a contact tube of the welding gun. According to the gun cleaning device for the welding gun, the nozzle of the welding gun can be disassembled, assembled and cleaned, the contact tube can be cleaned, the welding gun can be automatically cleaned, the nozzle can be replaced, the gun cleaning device is simple in structure and convenient to operate, the gun cleaning efficiency can be improved, and the labor cost can be saved.

An object of the present invention is to provide an arc welded joint that has less amount of slag and spatter adhesion and high corrosion resistance, and a method for manufacturing the same. An arc welded joint manufactured by arc welding includes a base material, a weld bead formed by fusing and solidifying the base material and a welding wire melted by heat input from arc, and a weld heat affected zone. In a weld spatter affected zone, the number of spatters generated during welding, adhering to the weld spatter affected zone, and each having an adhesion region with a maximum length of greater than or equal to 0.2 mm is less than or equal to 0.50 spatters / cm2, and a slag coverage area ratio SRATIO calculated by a predetermined equation using a bead surface area SBEAD of a weld bead surface and a slag surface area SSLAG, which is an area of a region of the bead surface area SBEAD covered with slag, is less than or equal to 15%.

The invention discloses an arc welding gun cleaning and wire reducing machine, and belongs to the related technical field of welding robots, the arc welding gun cleaning and wire reducing machine comprises a head shield, a middle shield and a tail shield, and further comprises a supporting column, a wire cutter and a gun cleaning device, the gun cleaning device is fixedly installed on the upper portion of the outer surface of one side of the supporting column, and the wire cutter is arranged on the outer surface of the side edge of the gun cleaning device; the gun cleaning device comprises an oil sprayer and a rotating base, the oil sprayer is fixedly installed on the upper portion of the inner side of the gun cleaning device, the rotating base is movably installed on the lower portion of the oil sprayer, a reamer is fixedly installed at the upper end of the rotating base, an arc-shaped cutter groove is formed in the upper surface of the reamer, and a cutter holder is fixedly installed in the wire cutter. A blade is movably mounted on the upper surface of the tool apron; maintenance operations such as gun cleaning, oil spraying and wire shearing in the daily maintenance process of the welding robot can be synchronously achieved, the time needed for maintenance of the welding robot is shortened, and the daily working efficiency of the welding robot is improved.

The present invention relates to a welding spatter protection device (1) comprising: - a support structure (2); - a movable structure (10), which delimits a first internal shielding cavity (11) by means of a plurality of internal side walls (11a,11b,11c,11d) and is movable with respect to said support structure (2) by means of a first actuator (15) between a lowered position, in which in use said first internal cavity (11) is placed astride the welding zone, and a raised position, in which in use said first internal cavity (11) is moved away from said welding zone, - a cleaning system (20) for cleaning the internal side walls (11a,11b,11c,11d) of said first internal cavity from welding spatter, comprising a scraper (21). Two second walls (11c,11d) interconnect said two first walls (11a,11b) to each other and define two concentric cylindrical surfaces. The scraper (21) is rotationally connected to said movable structure (10) by means of a support arm (22) which is pivoted on a rotation axis (Y1) coincident with the axis (O) of said two concentric cylindrical surfaces (11c, 11d) and supports said scraper (21), keeping it aligned on a radial plane, said support arm (22) being actuatable by means of a second actuator (25). The circumferential ends (11c',11c";11d',11d") of said two concentric cylindrical surfaces (11c,11d) at an inlet mouth (12) and at an internal stop position are radially aligned so that the scraper (21) is always in contact with said two concentric cylindrical surfaces (11c,11d), said two concentric cylindrical surfaces (11c,11d) being oriented so that the radially outermost cylindrical surface (11c) extends beyond the bottom wall (10a) of said movable structure (10), defining a shielding appendage (16).

This application relates to a welding torch cleaning device, belonging to the technical field of welding equipment. It includes a base, on which a positioning block is rotatably connected. The upper end face of the positioning block has a positioning groove for inserting a welding torch nozzle, and the lower end of the positioning block has a receiving groove. The upper end of the positioning block also has a positioning hole for inserting a tungsten needle of the welding torch. The positioning hole is located at the center of the positioning groove and communicates with the receiving groove. A sleeve coaxial with the positioning hole is provided within the positioning groove. The sleeve is inserted into the nozzle. Multiple inner scrapers, evenly distributed around the center line of the positioning hole, are provided on the inner wall of the sleeve. The inner scrapers abut against the side wall of the tungsten needle. A driving component for rotating the positioning block is provided on the base. This application effectively cleans welding residue adhering to the inside of a high-speed welding torch, improving welding quality.

A welding torch 10 is provided for use in a Gas Metal Arc Welding (GMAW) process. The welding torch 10 includes a torch body 12, a welding tip 16 extending from the torch body 12, and a detachable nozzle 22 which substantially surrounds the welding tip 16 in use to direct gas around the welding tip 16 and onto a workpiece, the nozzle 22 having a front end which faces the workpiece in use and a rear end which attaches to the torch body 12 in use, in which a ring 24 is provided, the ring 24 being substantially axially fixed to the nozzle 22 at the rear end of the nozzle 22, and the ring 24 being rotatable with respect to the nozzle 22, the ring 24 having a screw thread and the torch body having a corresponding screw thread 26, for fixing the nozzle 22 to the torch body 12.

To provide a welding spatter protection device with an integrated cleaning system.SOLUTION: A welding spatter protection device (1) comprises: a support structure (2); a movable structure (10), which is movable by means of a first actuator (15) between a lowered position, in which in use a first internal cavity (11) is placed astride the welding zone, and a raised position, in which in use said first internal cavity (11) is moved away from said welding zone; and a cleaning system (20) for cleaning internal side walls (11a, 11b, 11c, 11d) of said first internal cavity from welding spatter, comprising a scraper (21). The scraper (21) is rotationally connected to said movable structure (10) by means of a support arm (22) which is pivoted on a rotation axis (Y1) coincident with the axis (O) of said two concentric cylindrical surfaces (11c, 11d) and supports said scraper (21). Said support arm (22) can be driven by means of a second actuator (25).SELECTED DRAWING: Figure 6

A welding device includes a frame body, a first movable module, a second movable module, a third movable module, and a welding module. The first movable module is installed on the frame body and movable in a first horizontal direction. The second movable module is installed on the first movable module and movable in a second horizontal direction perpendicular to the first horizontal direction. The third movable module is installed on the second movable module and movable in a vertical direction perpendicular to the first and second horizontal directions. The welding module is installed on the third movable module and movable together with the first, second, and third movable modules. The welding module is suspended outside the frame body, and the first movable module is provided in an inner chamber of the frame body to reduce the distance between the welding module and the frame body.

The purpose of the present invention is to provide an arc welded joint having excellent corrosion resistance in which the adhesion amount of slag and the adhesion amount of spatter are reduced, and a method for manufacturing the arc welded joint. Provided is an arc welded joint manufactured by arc welding, the arc welded joint having a base material, a welding bead formed by mixing and solidifying the base material, which is melted by heat input from an arc, and a welding wire, and a welding heat-affected portion, the number of spatter, which is generated during welding and has a maximum length of 0.2 mm or more, in an adhesion region that adheres to the welding spatter-affected part is 0.50 spatter / cm2 or less; a slag-covered area ratio (SRATIO) calculated by a prescribed formula using a bead surface area (SBEAD) of a welding bead surface and a slag surface area SSLAG, which is the area of a region covered with slag in the bead surface area (SBEAD), is 15% or less.