KR101542424B1 - Portable welding wire-feeder - Google Patents

Portable welding wire-feeder Download PDF

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Publication number
KR101542424B1
KR101542424B1 KR1020140079562A KR20140079562A KR101542424B1 KR 101542424 B1 KR101542424 B1 KR 101542424B1 KR 1020140079562 A KR1020140079562 A KR 1020140079562A KR 20140079562 A KR20140079562 A KR 20140079562A KR 101542424 B1 KR101542424 B1 KR 101542424B1
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KR
South Korea
Prior art keywords
welding wire
feeding roll
main body
feeding
welding
Prior art date
Application number
KR1020140079562A
Other languages
Korean (ko)
Inventor
곽규문
Original Assignee
주식회사 에스아이피
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to KR1020140079562A priority Critical patent/KR101542424B1/en
Application granted granted Critical
Publication of KR101542424B1 publication Critical patent/KR101542424B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/124—Circuits or methods for feeding welding wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/095—Monitoring or automatic control of welding parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/122—Devices for guiding electrodes, e.g. guide tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
    • B23K9/1333—Dereeling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
    • B23K9/1336—Driving means

Abstract

The present invention relates to a portable welding wire feeder and, more specifically, relates to a portable welding wire feeder which conducts rotating in advance of a welding wire to form welding beads uniformly while facilitating a weaving process in feeding a welding wire to a melting part during tungsten inert gas (TIG) welding. According to the present invention, the portable welding wire feeder comprises: a cylindrical main body to insert a welding wire and guiding in advance in a longitudinal direction; a handle hinged to one side of the main body to enable a user to grab and operate the portable welding wire feeder, and adjust an orientation angle of the main body; and a feeding device to conduct rotating in advance of a welding wire to the outside as mounted in connection inside the main body and the handle.

Description

[0001] PORTABLE WELDING WIRE-FEEDER [0002]

The present invention relates to a portable welding wire feeder, and more particularly, to a portable welding wire feeder for feeding a welding wire to a melting portion during TIG (Tungsten Inert Gas Welding) welding, To a portable welding wire feeder capable of achieving rotational advancement of a welding wire for uniform formation.

Recent developments in industrial technology (industrial technology, industrial technology), as well as the development of welding and bonding technology, are industrial-based technologies to improve the productivity and quality of products, from small electronic products requiring precision technology to marine structures, aircraft , And other industrial facilities.

Therefore, countries around the world are making efforts to improve the safety and precision of products through automation of technology and development of new technology in order to increase productivity, which directly affects price competitiveness of exported products.

Tungsten Inert Gas Welding (TIGS) is one of the most advanced technologies in the field of arc welding, including the aerospace, shipbuilding, railway, automobile, Semiconductors, electronic appliances, nuclear power plants, and ice machines.

Tungsten Inert Gas Welding (TIG) is a technique in which an arc is generated between a tungsten electrode and a base metal in an inert gas such as argon or helium One type of arc welding method for welding base metal is to supply a bar-shaped welding rod (hereinafter referred to as "welding wire") supplied for dissolving in order to make weld metal, .

Particularly, it is a welding method which is suitable for welding of aluminum, magnesium alloy, and stainless steel, which is suitable for welding of the first layer of the ultra thin steel plate, thin steel plate (less than 2 mm) . In addition, arc and molten metal are protected by inert gas, and arc stability and weld metal characteristics are excellent.

On the other hand, in performing the TIG welding, the ability of the operator has the greatest influence for more precise and precise welding. In other words, the welding wire must be fed while maintaining a certain distance from the welding part, and a precise weaving (welding method in which the welding wire is welded while moving the welding wire side to side in the direction of welding) The welding condition is determined according to how well the process is performed.

For this purpose, the Korean Registered Utility Model No. 20-0443638 discloses a portable welding wire feeder capable of holding the user in one hand and automatically feeding the welding wire continuously at a constant speed during manual welding using the rod welding wire The device has been disclosed.

FIG. 1A is a perspective view showing an external structure of a portable welding wire feeding apparatus according to the related art, FIG. 1B is a plan view showing a structure of a welding wire feeding unit in a conventional portable welding wire feeding apparatus, As shown in the drawing, the welding wire feeding device includes a handle 910 having a size that the user can hold with one hand; A first feeding roller 921 rotated by a driving source (a motor or the like), a second feeding roller 921 opposed to the first feeding roller 921 with a welding wire w therebetween and supported by a bearing 961, A welding wire feeding portion 920 including a first feeding roller 922 and a housing 925 which surrounds the first feeding roller 921 and the second feeding roller 922 and is installed at an upper end of the knob 910; A bearing 961 supporting the second feeding roller 922 and hinged to the housing 925 and a second feeding roller 922 coupled to one side of the bearing 961 so as to be vertically movable, And an elastic body 963 provided between the bearing 961 and the pressing force adjusting bolt 962 to provide elasticity so that the first feeding roller 921 and the second feeding roller And a pressing portion 960 pressing the welding wire 900 so as to be engaged with the welding wire 900. The welding wire 900 is attached to one side of the welding wire feeding portion 920 and guides the welding wire 900 to the melting portion A nozzle unit 930 for ejecting ink droplets; And a switch 940 installed on one side of the handle 910 to turn on / off power supplied to the driving source.

According to the conventional technique, a rod-like welding wire 100 having a desired diameter is inserted into the housing 925, and then the second force feed screw 962 is tightened so that a proper pressing force is generated. The driving source is operated by operating the switch 940 attached to one side of the handle 910 after the roller 922 is pressed and the first feeding roller 921 rotated by the driving source operation The wire 900 is automatically fed to the melting region for welding via the nozzle unit 930, so that even a novice worker who is inexperienced can perform welding work efficiently.

However, it is only necessary to feed the welding wire 900 to the molten portion while the user grasps the welding wire (w), and it is necessary to ensure uniformity of the weld bead, which is very important in the TIG welding And the technical means (and apparatus) that can help improve the efficiency of the weaving process are not provided, and thus the usability has not been shown.

Korean Utility Model Registration No. 20-0443638 (Published on Jan. 07, 2009)

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide a welding apparatus and a welding method for welding a welding bead to a welded portion, And it is an object of the present invention to provide a portable welding wire feeder capable of ensuring uniformity and facilitating the process of weaving.

It is another object of the present invention to provide a welding apparatus and a welding method for welding a welding wire to a welding apparatus such that a joining region between a cylindrical body for welding a welding wire and a handle for a user grip is changed in a hinge And it is an object of the present invention to provide a portable welding wire feeder that can be adjusted in various directions in accordance with a demand.

According to an aspect of the present invention, there is provided a welding apparatus comprising: a cylindrical body for inserting and advancing a welding wire in a longitudinal direction; A handle hinged to one side of the main body so as to adjust a directing angle of the main body together with a user gripping operation; And a feeding device for rotating and advancing the welding wire to the outside in a state of being connected to the inside of the main body and the inside of the handle.

The handle is protruded and hinged outward from one side of the main body while the front portion is provided with a drive switch for turning on and off the movement of the welding wire and stopping the movement of the welding wire while being held by hand And the hinge portion is provided with a feed correction switch capable of arbitrarily adjusting the advancing speed of the welding wire.

In addition, the feeding device may include a geared motor for generating power, which is mounted in association with the main body and the inner space of the handle, and a geared motor for driving the geared motor, A first feeding roll which rotates in one direction so as to advance the welding wire outwardly by using power, and a second feeding roll which is supported in close contact with the other side of the welding wire facing the first feeding roll, An angle adjusting member for externally adjusting an angle change of the first feeding roll and the second feeding roll in a state of being associated with the first feeding roll and the second feeding roll, A universal joint for shaft coupling between the first feeding roll and the geared motor, the angle of which can be changed, and the hinge coupling of one side of the second feeding roll, For features a tension portion configured.

In addition, a grounding reinforcing member is formed on an outer surface of the first feeding roll and the second feeding roll for maximizing the rotational advance of the welding wire through the adhesion strengthening.

In addition, the angle adjusting member is moved in mutually corresponding directions when the operating levers are operated, with the operating levers projecting to the outside of the main body and the upper portions of the first feeding roll and the second feeding roll, A plurality of stagger holders for changing an angle in which the first feeding roll and the second feeding roll are tilted in both directions and a plurality of stagger holders linked to each other, And an assembling step of assembling them.

As can be clearly understood from the above description, the portable welding wire feeder of the present invention can automatically feed the welding wire continuously to the penetration portion of the base material for welding and, at the same time, The weld bead formed on the welded portion is uniform and precise, and the jointability and durability of the welded portion are greatly improved.

In addition, it is possible to control the welding speed of the welding wire through resistance variable, so that the operator can send the welding wire at the desired speed, so that even the novice worker can perform the TIG welding more easily, In addition, it has the effect of greatly improving the quality of the welding work as a whole.

In addition, improvement of the TIG welding work environment in preparation for the gradual decrease of the related engineers due to the fact that the above-mentioned various effects are achieved, Of course, it is a very useful invention that can greatly contribute to the development and activation of a wide variety of related industrial fields such as aerospace, shipbuilding, railroad, automobile, semiconductor, electric appliances, nuclear power plant, and iceberg machine.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view showing an external structure of a portable welding wire feeding apparatus according to the prior art; FIG.
FIG. 1B is a plan view showing a structure of a welding wire feeding portion in a portable welding wire feeding apparatus according to the prior art. FIG.
2 is a side view showing an external structure of a portable welding wire feeder according to the present invention;
3A and 3B are a side sectional view and a front sectional view showing the internal structure of a portable welding wire feeder according to the present invention.
Fig. 4 is an explanatory view of the configuration of the feeding apparatus in the portable welding wire feeder according to the present invention. Fig.
FIG. 5A and FIG. 5B are enlarged views showing the operation relationship of the feeding apparatus in the portable welding wire feeder according to the present invention. FIG.
6 is an exemplary sectional view showing an angle adjustment relationship of a handle in a portable welding wire feeder according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

FIG. 2 is a side view showing an external structure of a portable welding wire feeder according to the present invention. FIGS. 3a and 3b are a side sectional view and a front sectional view showing the internal structure of a portable welding wire feeder according to the present invention, FIG. 4 is a perspective view illustrating a configuration of a feeder in a portable welding wire feeder according to the present invention. FIG. 5A and FIG. 5B are views showing the operation of the feeder in a portable welding wire feeder according to the present invention. And FIG. 6 is an exemplary sectional view illustrating an angle adjustment relationship of the handle in the portable welding wire feeder according to the present invention.

2 and 3A, a portable welding wire feeder A according to the present invention includes a cylindrical main body 1 for guiding insertion and longitudinal advancement of a welding wire w, A handle 2 hinged to one side of the main body 1 so as to be capable of adjusting the directing angle of the main body 1 in conjunction with the gripping operation; And a feeding device (3) for rotating and advancing the wire (w) outward.

The main body 1 is a housing for precisely guiding the feeding of the welding wire w to the welding portion (the penetration portion of the base material). The main body 1 has an inner hollow cylindrical shape And the guide collet 11 and the guide nozzle 12 for holding the insertion (insertion) and the discharge (penetration) of the welding wire w are coupled to the front and rear ends, respectively.

The welding wire w can be easily inserted into the main body 1 through the guide collet 11 and the welding wire w having passed through the guide collet 11 through the guide nozzle 12. [ (Welded portion) of the base material to be welded can be maintained in a state in which the outward advancement to be fed to the welded portion (welded portion) of the base material is constant and precisely maintained.

The handle 2 is a handle gripped by one hand of the welding worker (user) for grasping the use of the wire feeder and directing the welding wire w passing through the main body 1, A drive switch 21 is provided on the front portion to turn on and off the operation of the welding wire w for advancing and stopping the welding wire w while being held by hand while being hinged outwardly from one side of the welding wire 1 And a feed correction switch 22, which can arbitrarily adjust the advance speed of the welding wire w, is further provided on the hinge portion.

In addition, it is preferable that a power supply rechargeable battery 23, which is necessary for driving the apparatus, is detachably attached to the lower portion of the protrusion, but the present invention is not limited thereto. It is possible that it may be different.

The feeder 3 is a means for advancing the welding wire w penetrated and inserted along the longitudinal direction of the main body 1 to the outside and delivering the welding wire w to the penetration portion of the base material. As shown in FIGS. 3B and 4, A geared motor 31 that is installed in cooperation with the main body 1 and the inner space of the handle 2 and that is required to generate power and a state in which it is closely disposed on one side across the welding wire w in the main body 1 A first feeding roll 32-1 rotating in one direction so as to advance the welding wire w to the outside by using the power of the geared motor 31, A second feeding roll 32-2 for performing no-load rotation in a state of being closely supported on the other side of the opposing welding wire w, and a second feeding roll 32-2 connected to the first and second feeding rolls 32-1 and 32-2 An angle adjusting member 33 for externally adjusting the angle of the first and second feeding rolls 32-1 and 32-2; A universal joint 34 for shaft coupling between the first feeding roll 32-1 and the geared motor 31 and a hinge connection on one side of the second feeding roll 32-1, And a tension unit 35 for reinforcing the tension.

The geared motor 31 reduces the revolutions per minute (RPM) of the drive shaft 311 by a combination of an electric motor and a reduction gear device, torgue is a power unit capable of greatly increasing the rotational force of the first feeding roll 32-1 with maximized structural characteristics.

5A and 5B, the first feeding roll 32-1 has a rotating function of advancing the welding wire w inserted into the main body 1 to the outside, The welding wire w is pushed in the oblique direction so that the rotational force for drawing the helical orbit can be added in accordance with the change of the angle of the welding wire w.

To this end, the interlocking shaft 32-11, which is the central axis, is connected to the driving shaft 311 of the geared motor 31, and the multi-angle refraction is possible by the universal joint 34. [

The second feeding roll 32-2 is hinged to the inside of the main body 1 with the lower end of the support shaft 32-21 serving as the central shaft connected to the tension unit 35, The ball bearing 32-22 further includes a support shaft 32-21 so as to surround the support shaft 32-21.

The first and second feeding rolls 32-1 and 32-2 are each provided with a grounding reinforcing member 320 for maximizing the rotational movement of the welding wire w by enhancing the adhesion force, The ground reinforcing member 320 is preferably a hemispherical inwardly oriented groove arranged in a plurality of rows and columns. However, the present invention is not limited thereto. For example, the ground reinforcing member 320 may be formed in a tread shape or a patterned shape by embossing You can apply a variety of patterns.

The angle adjusting member 33 includes an operation lever 331 protruding out of the main body 1 so that the user can directly control the angle adjusting member 33 and the angle adjusting member 331 of the first and second feeding rolls 32-1, The first and second feeding rolls 32-1 and 32-2 are moved in the mutually corresponding directions by the control of the operation lever 331 in a state of cooperating with the upper side And a plurality of stagger holders 332 are linked to each other so that both ends of the stagger holders 332 are moved in directions different from each other And a cooperative assembly of a rotating table 333 for simultaneous rotation.

Here, the stagger holder 332 surrounds the upper end of each of the interlocking shaft 32-11 and the support shaft 32-21 of the first and second feeding rolls 32-1 and 32-2, However, the present invention is not limited to this, and it is possible to adopt various structures as long as the interlocking shaft 32-11 and the supporting shaft 32-21 can be partially accommodated.

In addition, a holder shaft 332-1 for engaging with each of the distal end portions of the rotating table 333 is protruded by a predetermined length at the upper end thereof.

A shaft hole 333-1 is formed in the center of the swivel base 333 so as to be fixed to the main body 1 by passing a hinge pin serving as a rotation center of both ends of the swivel base 333, A long hole 333-2 is formed in consideration of the straight moving trajectory of the support shaft 32-11 and the support shaft 32-21.

As described above, the universal joint 34 is a coupling member used to connect two shafts having an angular deviation, and the first feeding roll 32- 1, the interlocking shaft 32-11 rotating along the drive shaft 311 of the geared motor 31 can smoothly rotate.

The tension unit 35 includes a guide bar 351 protruding from the inner surface of the main body 1 by a predetermined length and having a diameter larger than that of the guide plate 351-1 at the tip thereof, A slide ring 352 integrally joined to the lower end of the guide ring 351 so as to be bi-directionally movable along the guide rod 351 while being wrapped around the guide rod 351, And an elastic spring 353 for the continuous advance action of the spring.

(P) is a circuit board that facilitates data input / output exchange during device driving.

The operation of the portable welding wire supplier A according to the present invention having the above-described structure will be described in detail as follows.

As described so far, the welding wire (w) necessary for the TIG welding operation is inserted into the main body (1) of the wire feeder (A) of the present invention composed of a single body to complete work preparation.

The insertion of the welding wire w can be easily accomplished by using the guide collet 11 coupled to the rear end of the main body 1. The welding wire w inserted into the main body 1, Can be easily discharged through the guide nozzle (12) coupled to the front end of the main body (1).

Thereafter, a welding torch (not shown) for performing a TIG welding operation is grasped with one hand, while the other part of the welding torch (not shown) is held by the welding wire the direction of the guide nozzle 12 of the main body 1 is set so that it is directed toward the main body 1.

Referring to FIG. 6, the angle of the handle 2 can be changed from the main body 1, and the orientation angle of the welding wire w described above can be simply changed.

Next, power is supplied from the battery 23 to the geared motor 31 by pressing the drive switch 21 formed on the handle 2 for operation of the apparatus, thereby driving the drive shaft 311 of the geared motor 31 The rotation of the first feeding roll 32-1 and the subsequent advancement of the welding wire w to the outside of the main body 1 are performed simultaneously with the rotation of the first feeding roll 32-1, The welding wire (w) can be delivered.

5A and 5B, when the operation lever 331 of the angle adjusting member 33 of the feeding device 3 is pushed in a desired direction, And the first and second feeding rolls 32-1 and 32-2 can be changed in the bidirectional angle between the first and second feeding rolls 32-1 and 32-2, 1 feeding roller 32-1 feeds the welding wire w in the diagonal direction so that the welding wire w is wound around the guide nozzle 12 of the main body 1 in a state in which the rotation of drawing the helical orbit is added, It is to advance to the outside.

In summary, according to all the processes and operations described so far, the welding wire w can be accurately fed into the penetration portion of the base material, and the effect of forming the welding bead uniformly and precisely can be obtained at the same time. In addition, the present invention can be advantageous in facilitating the weaving process, which is a welding method for welding the welding wire w while alternately moving side by side with respect to the advancing direction of the welding, more easily and promptly.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications may be made without departing from the scope and spirit of the invention.

A: Wire feeder, 1: Body, 2: Handle
3: feeder, 11: guide collet, 12: guide nozzle
21: rechargeable battery, 22: drive switch, 23: feed correction switch
31: geared motor, 32-1: first feeding roll, 32-2: second feeding roll
32-11: interlocking shaft, 32-21: support shaft, 32-22: ball bearing
33: angle adjusting member, 34: universal joint, 35: tension member
311: drive shaft, 320: ground reinforcing member, 331: operation lever
332: stagger holder, 332-1: holder shaft, 333: turntable
333-1: shaft hole, 333-2: long hole, 351: guide rod
351-1: paper sheet, 352: slide ring, 353: elastic spring

Claims (5)

A cylindrical body for guiding insertion and longitudinal advancement of the welding wire;
A handle hinged to one side of the main body so as to adjust a directing angle of the main body together with a user gripping operation; And
And a feeding device for rotating and advancing the welding wire to the outside while being connected to the main body and the inside of the handle,
The feeding device is connected to the main body and the inner space of the handle,
A geared motor for generating power,
A first feeding roll which is rotationally operated in one direction so as to advance the welding wire to the outside by using the power of the geared motor in a state of being closely disposed on one side across the welding wire inside the main body,
A second feeding roll for performing no-load rotation while being closely held on the other side of the welding wire facing the first feeding roll,
An angle adjusting member for externally adjusting an angle change of the first feeding roll and the second feeding roll while being associated with the first feeding roll and the second feeding roll,
A universal joint for shaft coupling between the first feeding roll and the geared motor, the angle of which can be changed according to the operation of the angle adjusting member,
And a tensioning part for reinforcing the adhesion of the welding wire to the hinging part on one side of the second feeding roll.
The method according to claim 1,
The handle is protruded and hinged outward from one side of the main body,
The front portion is provided with a drive switch for turning on and off the operation of the welding wire for advancing and stopping the welding wire while being held by hand,
Wherein the hinge portion is provided with a feed correction switch capable of arbitrarily adjusting the advancing speed of the welding wire.
delete The method according to claim 1,
Wherein a grounding reinforcing member is formed on an outer surface of the first feeding roll and the second feeding roll for maximizing a rotational advancement effect of the welding wire by enhancing the adhesion force.
The method according to claim 1,
Wherein the angle adjusting member includes: an operation lever projected to the outside of the main body;
The first feeding roll and the second feeding roll are moved in mutually corresponding directions during the operation of the operation lever so as to tilt the first feeding roll and the second feeding roll in both directions, A plurality of pendulum holders for pivoting,
And a coupling assembly for coupling a plurality of said stagger holders to one another so that both ends of said stagger holders rotate in mutually corresponding directions when said operating lever is operated.
KR1020140079562A 2014-06-27 2014-06-27 Portable welding wire-feeder KR101542424B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102282731B1 (en) * 2020-12-10 2021-07-29 주식회사 한진엔지니어링 Welding filler material injection device
CN114289841A (en) * 2021-12-14 2022-04-08 山东华烨不锈钢制品集团有限公司 Gas protection device for outer weld joint of stainless steel water pipe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102282731B1 (en) * 2020-12-10 2021-07-29 주식회사 한진엔지니어링 Welding filler material injection device
CN114289841A (en) * 2021-12-14 2022-04-08 山东华烨不锈钢制品集团有限公司 Gas protection device for outer weld joint of stainless steel water pipe

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