JP4219174B2 - Laser welding method - Google Patents

Laser welding method Download PDF

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Publication number
JP4219174B2
JP4219174B2 JP2003001418A JP2003001418A JP4219174B2 JP 4219174 B2 JP4219174 B2 JP 4219174B2 JP 2003001418 A JP2003001418 A JP 2003001418A JP 2003001418 A JP2003001418 A JP 2003001418A JP 4219174 B2 JP4219174 B2 JP 4219174B2
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Prior art keywords
welding
laser
welded
filler wire
irradiation
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JP2004209536A (en
Inventor
良司 大橋
朗 松縄
聖二 片山
茂樹 藤長
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新明和工業株式会社
財団法人近畿高エネルギー加工技術研究所
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser welding method for welding a welded material by irradiating a laser beam while feeding a filler wire to a welded portion of the welded material, and in particular, a welding posture in which the direction of laser beam irradiation is upward or sideways. The present invention relates to a laser welding method that enables all-position welding including:
[0002]
[Prior art and its problems]
Arc welding, which has been widely used for joining metal materials from the past, increases the surface area of the melted part due to the expansion of the heat source, and in upward welding where the welded part is welded from below, it is easy to cause dripping of the weld metal due to gravity. Downward welding is fundamental. However, when assembling piping such as chemical plants and oil pipelines, welding by on-site construction is indispensable.For example, welding at all positions including upwards is required for all-around welding at butt joints of horizontal piping. I need it. In such a case, in arc welding, in order to reduce the sag of molten metal in upward welding, melting occurs intermittently while promoting solidification by reducing the molten metal volume and reducing the volume of molten metal. In this way, the welding current is controlled, but this leads to a significant decrease in welding efficiency.
[0003]
In vertical welding, where the weld line is welded along the vertical or nearly vertical plane from the front, welding is performed from the bottom to the top, or from the top to the bottom. In any of the downward weldings that are welded in this manner, the weld metal tends to hang down to the lower side of the groove due to gravity, and thus the same problem as described above occurs.
[0004]
On the other hand, in laser welding, high heat can be applied to a small spot by condensing the laser beam, so welding with a small melted surface area and deep penetration depth can be performed, but the tolerance to the gap of the welded portion is low. Therefore, it is common to perform machining in advance so as not to generate a gap in the butt portion in the entire circumference welding of a fixed pipe or the like. If the weld gap is unavoidable due to on-site construction, etc., laser welding will be performed while supplying filler material such as filler wire. Is considered to flow into the groove gap due to gravity, and for this reason, laser welding performed while feeding a filler wire cannot be applied to upward welding and vertical welding.
[0005]
Furthermore, in the welding of thick plates, in the case of arc welding, because the melting width is wide and the penetration depth is shallow due to the characteristics of arc discharge, multi-layer welding in which welding is repeated many times is generally adopted. In order to maintain a stable arc discharge, the distance between the electrode and the material to be welded is set to about 10 to 20 mm, and the groove shape of the welded portion is generally made into a V-shape on the surface side in view of the structure of the welding torch. Therefore, there has been a problem that the number of layers of multi-layer welding is increased and it takes a very long time. On the other hand, since laser welding has a deep penetration depth, welding with a plate thickness of several tens of millimeters can be performed with one layer if the groove butting accuracy is sufficiently secured. It takes a lot of work to machine the groove with high accuracy. In particular, it takes a lot of labor and time to adjust the position of the entire pipeline to weld large-diameter pipes without any gaps at the construction site, and a large holding mechanism to hold the pipe at the adjusted position. And mechanical devices are required. A pipe welding system using an electron beam has also been developed. In addition to the need for groove accuracy more than laser welding, it is necessary to place the weld locally in a vacuum state. However, there was a difficulty that it was very expensive.
[0006]
In view of the above-mentioned circumstances, the present invention is a laser welding method that is performed while feeding filler wire as a filler material to a welded portion, and enables reliable joining in upward welding and vertical welding even when having a groove gap. Thus, it is possible to perform all-position welding such as full circumference welding of a fixed pipe arranged horizontally in a short time efficiently, and to provide means that can eliminate the need for machining to ensure groove accuracy even when welding thick plates. The purpose is that.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a laser welding method according to claim 1 of the present invention is configured to irradiate a laser beam while feeding a filler wire to a welded portion of a material to be welded, and to apply the filler wire and the material to be welded. In laser welding in which a material to be welded is melted and welded via the melt, the welded portion of the material to be welded is a butt joint having a groove gap, and the irradiation direction of the laser beam is upward or / and lateral The filler wire is fed from the front of the welding progress direction to a position separated from the groove position of the groove gap in the direction in which the laser beam is irradiated. A plasma plume is generated in the welded part, and the melt is sent into the inner part of the welded part by the evaporation reaction force accompanying the generation of the plasma plume. There.
[0008]
According to a second aspect of the present invention, in the laser welding method of the first aspect, a laser beam of a modulated wave such as a rectangular modulated wave or a sine modulated wave is used .
[0009]
The invention of claim 3 melts the filler wire and the welded material by irradiating a laser beam while feeding the filler wire to the welded portion of the welded material, and joins the welded material through the melted product. in laser welding, both the welding of the butt a joint, and the irradiation direction of the laser beam to the welding site itself is upwardly welded region and down to become welded area having a groove gap welding site of workpieces The filler wire is fed from the front of the welding progress direction to a position separated from the groove gap position of the groove gap in the direction in which the laser beam is irradiated. It is characterized in that a plasma plume is generated, and the melt is sent into the inner part of the weld by an evaporation reaction force accompanying the generation of the plasma plume. Further, in the laser welding method of claim 3, the invention of claim 4 employs a configuration in which the peak output of the modulated wave of the laser beam is set lower in the downward irradiation than in the upward irradiation.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an example of the configuration of a laser welding apparatus used in the laser welding method of the present invention. In the figure, 1 is a laser oscillator, 2 is a laser head incorporating an optical system such as a condenser lens, 3 is an optical fiber for transmitting laser light emitted from the laser oscillator 1 to the laser head, and 4 is wire feeding. 50, a conduit cable of filler wire 5 fed from the feeding device 4, 6 a wire feeding head, 7 a welding control for controlling the laser oscillator 1 and the wire feeding device 4 and a welding robot (not shown). The apparatus, W1, is a metal pipe of fixed piping arranged horizontally as a material to be welded. The laser head 2 and the wire delivery head 6 are held and operated by a welding robot.
[0013]
When laser welding is performed, the welding conditions are preliminarily set in the welding control device 7 (the size and shape of the workpiece, the thickness of the welded portion, the gap width, the welding path, the laser average output, the laser modulation waveform and frequency, the peak output, and the filler wire feed speed. Etc.) are input. A predetermined laser beam emitted from the laser oscillator 1 is transmitted to the laser head 2 via the optical fiber 3 in accordance with a command signal output from the welding control device 7 based on the welding conditions. While the welding point is condensed and irradiated from 2, the wire feeding device 4 feeds the filler wire 5 at a predetermined feeding speed, and the welding robot moves the laser head 2 and the wire delivery head 6 around the pipe W 1. The pipes W1 and W1 are all-around butt-welded by making one round at a predetermined speed.
[0014]
FIGS. 2A and 2B show an arrangement state in the case of performing the above-described all-around butt welding by the laser welding method of the present invention. As shown in the figure, the pipes W1 and W1 form an I-type butt joint having a groove gap G in the welded portion, and a filler wire fed out from the wire delivery head 6 at a welding point where the laser beam L from the laser head 2 is condensed. 5 is set so as to be separated from the groove position of the groove gap G in the direction in which the laser beam is irradiated (that is, the direction from the workpiece W toward the condenser lens 2a) . Further, the laser head 2 and the wire delivery head 6 make a round around the pipe W1 while maintaining the arrangement state, and the circulation direction is the direction in which the filler wire 5 is fed from the front in the welding progress direction, that is, FIG. Let B be the clockwise direction (clockwise).
[0015]
In the laser welding described above, when a laser beam L having a high peak output such as a rectangular modulation wave is irradiated to the welding point, the molten metal part vigorously evaporates to generate a plasma plume. A phenomenon is observed in which it is blown in the opposite direction to the plasma plume, that is, the inner depth of the weld. As a result of this phenomenon, the molten metal is fed into the inner part of the welded part without dripping down in the lower half of the pipe W1, that is, in the region where the irradiation direction of the laser beam L is higher than the horizontal. As a result, it has been proved that high-quality all-round butt welding can be efficiently performed in a short time as a result of reliable welding over the entire thickness of the pipe peripheral wall.
[0016]
Thus, the result of further detailed analysis of the above phenomenon by high-speed camera observation, and the element of the weld cross section when using a filler wire having a specific element (Cr) content ratio in Example 1 described later that is different from the material to be welded From the analysis results, it is estimated that the following behavior occurs in the upward welding region in the laser welding performed while feeding the filler wire 5 to the welded portion having the groove gap G.
[0017]
That is, as schematically shown in the cross section along the butt end face of FIG. 3, the filler wire 5 is first melted to form droplets 5a ... by the irradiation of the laser beam L, and a part of the filler wire 5a evaporates to evaporate the wire plasma plume. P1 is generated, and by the evaporation reaction force, the droplets 5a... Fly upward along the irradiation direction of the laser beam L and are sent into the groove gap, and then the remaining laser beam L consumed for melting the filler wire 5 is generated. As a result of the excess energy, a keyhole is formed in the base material of the workpiece W and a keyhole plasma plume P2 is generated in the keyhole, and the evaporation reaction force causes the base material melt and the droplet 5a. The molten metal 8 is pushed up along the keyhole as indicated by the arrow s to generate an upward hot water flow, and the molten metal 8 travels to the inner end of the weld. Open destination total thickness of the weld is assumed to be made me. In FIG. 3, 9 is an unwelded end face that is a groove of the workpiece W, 10 is a welding completion part, 11 is a molten pool, 2 a is a condensing lens of the laser head 2, arrow F is a welding traveling direction, Respectively.
[0018]
Therefore, according to the laser welding method of the present invention, reliable joining is possible in all postures including an upward welding posture in which the irradiation direction of the laser beam is upward and a welding posture in which the irradiation direction is lateral. Even upward welding of a type I butt joint with a gap in the groove does not cause dripping of the molten metal. For this reason, even when welding by field construction is required, for example, assembling pipes in chemical plants or petroleum pipelines, etc., all-position welding such as full circumference welding of horizontally arranged fixed pipes can be efficiently performed with a simple device configuration. It can be done in a short time. In vertical welding, where the groove line is welded along the vertical plane or near vertical plane from the front, the laser beam irradiation direction is horizontal, but the welding progresses from bottom to top. On the contrary, in any downward welding in which welding is performed from top to bottom, the welding operation can be easily and efficiently performed without causing the weld metal to hang down. Furthermore, even if there is a groove gap as described above, upward welding can be performed without hindrance. Therefore, strict groove accuracy is not required even in thick plate welding, and alignment is simplified, and various structures, machines, etc. As a result, it is possible to remarkably increase the work efficiency of assembly work.
[0019]
As the laser oscillator 1 used in the laser welding method of the present invention, various solid and gas lasers can be used. In particular, a YAG laser is preferable from the viewpoint of laser characteristics and ease of device configuration. As the laser beam L, a continuous wave can be used, but a rectangular modulation wave and a sine modulation wave are more preferable. In other words, with rectangular and sine modulated waves, a high peak output is obtained even with the same average output for continuous waves, and at the same welding speed, the bead width is narrower than when continuous waves are used, and the melting in upward welding is correspondingly increased. Since the transport force upward of the metal 8 is increased, it is suitable for all-position laser welding using a filler wire of an I-type butt joint having a groove gap.
[0020]
In laser welding including both the welding region where the laser beam irradiation direction is upward and the welding region where the laser beam irradiation direction is downward as in the entire circumference butt welding of the pipe W1, the downward welding is performed. In the region where the molten metal is applied, gravity is added to the transport force of the molten metal to the inner side of the weld zone, so the peak output of the modulated wave of the laser beam should be set lower than the upward irradiation so that the evaporation reaction force will be smaller in the downward irradiation Is recommended.
[0021]
In addition, the laser welding method of the present invention can be applied to welding in all positions regardless of the irradiation direction of the laser beam, but welding in which the irradiation direction of the laser beam is upward, including the entire circumference welding of the horizontally disposed pipes. It is particularly suitable for a welding operation including a posture and a welding posture in which the irradiation direction is horizontal, such as vertical welding. Thus, the laser welding method of the present invention is not limited to a butt portion having a groove gap, and for example, fillet welding such as an L-shaped end joint portion between metal plates W2 and W2 shown in FIG. It can be similarly applied to welding of various groove shapes, such as welding of a butt portion between thick metal plates W3 and W3 in which the groove shape of the welded portion as shown in FIG. .
[0022]
In general, filler wires with a diameter of 0.8 mm or more are used due to restrictions on feeding performance. However, when the gap width is larger than the wire diameter in a type I butt joint having a groove gap at the welded part of the work piece. As shown in FIG. 4C, it is recommended that the filler wire 5 be fed into the groove gap G at a high speed. In any case, the filler wire 5 is preferably fed from the front in the welding direction to the welded portion in order to efficiently feed the droplets into the groove. Needless to say, the feed amount (feed speed) of the filler wire 5 is adjusted according to the gap width of the I-type butt joint, and the laser average output is adjusted according to this feed amount. Therefore, when the gap width in one melted portion varies depending on the welding position and the change in the gap width is known in advance, the feeding amount of the filler wire 5 may be changed in accordance with the change.
[0023]
【Example】
Hereinafter, the laser welding method according to the present invention will be specifically described by way of examples.
[0024]
Example 1
In the laser welding apparatus having the configuration shown in FIG. 1, a YAG laser oscillator 1 with an output of 4 kW is used as the laser oscillator 1, a 1.2 mm diameter SUS304 stainless steel wire is used as the filler wire 5, and a coated steel plate made of a mild steel sheet with a thickness of 5 mm is used. An I-type butt joint in which the welding material W is horizontally arranged and the groove is set to a parallel gap of 1 mm is set as a welding target, the laser beam L is set to a rectangular modulation wave (average output 3.3 kW, 50 Hz, duty 50%), The welded portion is shielded with nitrogen gas, and the filler wire 5 is fed at a feeding speed of 31 mm / s from the front side in the welding direction to a position 0.5 to 1.0 mm below the lower end of the gap, and the welding speed is 10 mm. As for / s, laser welding was performed in an upward welding posture in which a laser beam was irradiated perpendicularly from right below the weld.
[0025]
As a result, the welded portion was uniformly joined over the entire thickness as shown in the enlarged cross-sectional photograph of FIG. 5A without causing dripping of the molten metal. Further, using the fact that the Cr element of the SUS304 stainless steel used for the filler wire 5 is contained more than the mild steel of the workpiece W, the elemental analysis of the weld cross section was performed, and the distribution state of the Cr element was examined. As shown in FIG. 5B, the Cr element-rich region Z1 is uniformly distributed from the lower end to the upper end of the melted portion, and the filler wire 5 fed to the lower side of the gap serves as a filler material. Turned out to be sent to. In FIG. 5B, Z2 is a region where there is little Cr element in the unmelted part.
[0026]
Example 2
An I-type butt joint in which a workpiece W made of a SUS304 stainless steel plate having a thickness of 5 mm is horizontally arranged and a groove is set to a parallel gap of 1 mm is used as a welding object, and a 1.2 mm diameter SUS308 stainless steel wire is used as the filler wire 5. As the laser beam L, a continuous wave (average output 3.3 kW) and a rectangular modulation wave (average output 3.3 kW, 50 Hz, duty 50%) are used, and the welding speed is changed in three stages as shown in FIG. In the same manner as in Example 1, laser welding was performed in an upward welding posture. As a result, the welded portion was in the state shown in the enlarged cross-sectional photograph of FIG. The peak output of the rectangular modulated wave of the laser beam L is twice that of the continuous wave.
[0027]
As shown in FIG. 6, in the case of continuous wave, the melt of the filler wire 5 is transported and fused to the upper end of the material to be welded at a welding speed of 7 mm / s, but at a welding speed of 10 mm / s and 15 mm / s. The upper end of the groove gap is not fused. On the other hand, in the case of the rectangular modulation wave, the melt of the filler wire 5 is transported to the upper end of the material to be welded even at a welding speed of 15 mm / s. Even at the same welding speed, the continuous wave has a wider bead width than the rectangular modulated wave. From these, it can be seen that the use of a rectangular modulated wave having a higher peak output than the continuous wave has a higher force for transporting the melt of the filler wire 5 upward, and is suitable for upward welding.
[0028]
Example 3
A SUS304 stainless steel pipe W1 having a wall thickness of 5 mm and an outer diameter of 267.4 mm is arranged substantially horizontally as a material to be welded, and the width of the groove gap G is at the upper end position e as shown in FIGS. It is set to 0 mm, 0.5 mm at the left and right intermediate height positions c and g, and 1.0 mm at the lower end position a, and a rectangular modulation wave as the laser beam L (average output 3.45 kW, 50 Hz, duty 50%) , The welding speed was 5 mm / s, the filler wire feed amount was controlled according to the gap width, and all-around butt welding was performed. As a result, the cross section of the weld bead at each position a to h of the welded portion is less affected by the difference in the groove gap width and the welding posture, as shown in the enlarged sectional photograph of FIG. It was in a state.
[0029]
【The invention's effect】
According to the first aspect of the present invention, the filler wire and the welded material are melted by irradiating a laser beam while feeding the filler wire to the welded portion of the welded material, and the welded material is passed through the melt. In the laser welding method for welding the groove, the welding portion of the material to be welded is intended for a butt joint having a groove gap, and includes a welding posture in which the irradiation direction of the laser beam is upward or / and sideways. The filler wire is fed from the front of the welding progress direction to a position spaced in the direction in which the laser beam is irradiated from the gap position of the gap, and a plasma plume is generated in the filler wire and the weld by irradiation of the laser beam, The molten metal droops down by sending the melt into the inner part of the weld by the evaporation reaction force accompanying the generation of this plasma plume. Since it is possible to achieve a well-joined state, it is possible to simplify the alignment even when welding by on-site construction is required, such as assembly of pipes in chemical plants or oil pipelines, etc. We can perform all-position welding such as welding efficiently and in a short time with a simple device configuration, and even when welding thick plates, strict groove accuracy is not required, so work efficiency such as assembly construction of various structures and machines etc. It can be significantly increased.
[0030]
According to the invention of claim 2, in the above laser welding method, since a laser beam of a modulated wave such as a rectangular modulated wave or a sine modulated wave is used, the transport force of the molten metal due to the evaporation reaction force is increased. Good results are obtained as all-position laser welding using a filler wire of an I-type butt joint having a groove gap.
[0031]
According to the invention of claim 3, the filler wire and the welded material are melted by irradiating the laser beam while feeding the filler wire to the welded portion of the welded material, and the welded material is passed through the melt. in the laser welding for joining, as a target the butt joint with a groove gap welding site of workpieces, and to the welding site itself between the laser beam welding region where the irradiation direction is downward and the weld region to be a upward When both welding regions are included, the filler wire is fed from the front of the welding direction in a position spaced apart from the groove gap position in the laser beam irradiation direction, and the filler wire is irradiated by laser beam irradiation. And by generating a plasma plume in the weld, and sending the melt into the inner part of the weld by the evaporation reaction force accompanying the generation of this plasma plume, Since it can be in a good joining state without causing dripping of molten metal, even if welding by field construction is required, such as assembly of piping in a chemical plant or oil pipeline, for example, alignment can be simplified, It is possible to perform all-position welding such as all-around welding of fixed piping arranged horizontally in a short time with a simple apparatus configuration, and it is possible to remarkably improve the work efficiency of assembling construction of various structures and machines.
[0032]
According to the invention of claim 4, in the laser welding including the welding region in which the irradiation direction of the laser beam is directed upward and the welding region in which the laser beam is directed downward, a laser beam of a modulated wave such as a rectangular modulated wave or a sine modulated wave is applied. In addition, since the peak output of the modulated wave of the laser beam is set lower in the downward irradiation than in the upward irradiation, there is an advantage that the finished state of the weld becomes better.
[Brief description of the drawings]
FIG. 1 is a side view schematically showing a configuration example of a laser welding apparatus used in a laser welding method according to the present invention.
FIGS. 2A and 2B show an arrangement configuration of welding parts by the laser welding apparatus, wherein FIG. 2A is a longitudinal front view, and FIG. 2B is a side view at a groove position;
FIG. 3 is a longitudinal front view along a butt end face schematically showing the behavior in a welded portion by the laser welding method of the present invention.
FIG. 4 shows an application example of the laser welding method of the present invention, (A) is a longitudinal side view showing fillet welding of an L-shaped end joint between metal plates, and (B) is a V-shaped groove shape. FIG. 5C is a longitudinal sectional side view showing butt welding between metal thick plates formed into a shape, and FIG. 8C is a longitudinal front view showing I-type butt welding when a weld gap is relatively large with a groove gap.
5A and 5B show a welded part according to Example 1 of the present invention, in which FIG. 5A is an enlarged cross-sectional photograph of the welded part, and FIG. 5B is an elemental analysis photograph showing a Cr distribution state of the welded part.
FIG. 6 is a characteristic correlation diagram in which a difference in welding bead due to a difference in laser beam waveform and welding speed according to Example 2 of the present invention is compared by an enlarged cross-sectional photograph.
FIG. 7 shows a circumferential butt welding in which the groove gap width of the pipe material according to the third embodiment of the present invention differs depending on the welding position, (A) is a side view showing a circumferential welding position in the groove of the pipe material; (B) is a schematic front view exaggeratingly showing a groove gap due to a butt of pipe materials.
FIG. 8 is a correlation diagram between a bead cross section and a filler wire feeding speed according to an enlarged cross sectional photograph of each welding position shown in FIG. 7 (A).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Laser oscillator 2 Laser head 2a Condensing lens 3 Optical fiber 4 Wire feeder 5 Filler wire 5a Droplet (melt)
6 Wire delivery head 7 Welding control device 8 Molten metal (melt)
9 Unwelded end face 10 Weld completion part 11 Weld pool F Welding direction G Groove gap L Laser beam P1 Wire plasma plume P2 Keyhole plasma plume W Welded material W1 Metal pipe (welded material)
W2 Metal plate (material to be welded)
W3 metal plate (material to be welded)
W4 material to be welded s upward hot water flow

Claims (4)

  1. In laser welding to melt the filler wire and the welded material by irradiating the laser beam while feeding the filler wire to the welded portion of the welded material, and joining the welded material through the melt,
    Including a welding position in which the welded portion of the workpiece is a butt joint having a groove gap and the irradiation direction of the laser beam is upward or / and laterally;
    While feeding the filler wire from the front of the welding progress direction to a position separated from the groove position of the groove gap in the direction in which the laser beam is irradiated ,
    A laser welding method characterized in that a plasma plume is generated in a filler wire and a welded portion by irradiation with a laser beam, and a melt is fed into an inner part of the welded portion by an evaporation reaction force accompanying the generation of the plasma plume.
  2.   The laser welding method according to claim 1, wherein a laser beam of a modulated wave such as a rectangular modulated wave or a sine modulated wave is used.
  3. In laser welding to melt the filler wire and the welded material by irradiating the laser beam while feeding the filler wire to the welded portion of the welded material, and joining the welded material through the melt,
    The welded portion of the material to be welded is a butt joint having a groove gap, and the welded portion itself includes both a welded region in which the laser beam irradiation direction is directed upward and a welded region in which the welded region is directed downward;
    While feeding the filler wire from the front of the welding progress direction to a position separated from the groove position of the groove gap in the direction in which the laser beam is irradiated ,
    A laser welding method characterized in that a plasma plume is generated in a filler wire and a welded portion by irradiation with a laser beam, and a melt is fed into an inner part of the welded portion by an evaporation reaction force accompanying the generation of the plasma plume.
  4.   4. The laser welding method according to claim 3, wherein a laser beam of a modulated wave such as a rectangular modulated wave or a sine modulated wave is used, and the peak output of the modulated wave of the laser beam is set lower in the downward irradiation than in the upward irradiation.
JP2003001418A 2003-01-07 2003-01-07 Laser welding method Expired - Fee Related JP4219174B2 (en)

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JP5667344B2 (en) * 2009-01-22 2015-02-12 オー・エム・シー株式会社 Laser emission unit
JP5812527B2 (en) * 2011-03-30 2015-11-17 バブ日立工業株式会社 hot wire laser welding method and apparatus
EP2825345A1 (en) * 2012-03-14 2015-01-21 Tata Steel Nederland Technology B.V. Method of producing a continuous metal strip by laser welding using a filler wire
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JP6300778B2 (en) * 2015-12-22 2018-03-28 日新製鋼株式会社 Stainless steel laser welded section manufacturing method with excellent corrosion resistance and antiglare properties
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