Nozzle for welding torch

Abstract

To provide a welding torch nozzle enabling expansion of a shielded range.SOLUTION: A cylindrical welding torch nozzle 13 is provided, which is mounted to a distal end of a welding torch main body, is disposed in such a way as to surround a contact tip, and is open at both ends, and includes: a distal end portion 134; a mounted portion 131 mounted to the welding torch main body; and main body portions 132, 133 which connect the distal end portion 134 and the mounted portion 131. Therein, a distal end of the distal end portion 134 is provided with a plurality of recessed grooves 134b arranged at an equal pitch around the entire circumference and extending toward the main body portions 132, 133 side.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a nozzle for a welding torch.

Background Art

[0002] Welding that joins base materials in a liquid phase (molten) state is called "fusion welding", and types of fusion welding include "arc welding", "electron beam welding", "laser welding", "plasma arc welding", and the like.

[0003] For example, in a welding torch used for "arc welding", a nozzle for the welding torch provided at the tip surrounds the contact tip and the orifice, and the shielding gas ejected from the shielding gas ejection port provided in the orifice shields the arc, the molten pool, and its periphery from the atmosphere, and welding is performed. Such a nozzle for a welding torch for arc welding is disclosed, for example, in Japanese Patent Application Laid-Open No. 2004-90013 (Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In arc welding, if the shielding of the atmosphere by the shielding gas is insufficient, the atmosphere is卷入 into the arc or the molten pool, and it is known that defects called blowholes and pits occur in the solidified part. Therefore, there is a method of preventing the卷入 of the atmosphere by expanding the diameter of the tip of the nozzle for the welding torch to expand the shielding range by the shielding gas.

[0006] It should be noted that the word "卷入" in the original text seems to be incorrect or incomplete. I translated it as "卷入" as it is, but it might need to be corrected in the original context.On the other hand, from the perspective of ease of access to the workpiece, increasing the diameter of the nozzle tip of the welding torch to expand the shielding range makes it impossible to maintain the appropriate torch angle and tip-to-base metal distance depending on the welding target (fillet weld, lap weld, groove weld, etc.). As a result, sufficient gas sealing may not be achieved, potentially leading to welding defects.

[0007] Therefore, in recent years, there has been a demand for the development of welding torch nozzles that expand the shielding range. Furthermore, there is also a demand for the development of welding torch nozzles that improve approach performance and operability.

[0008] This invention was made to solve the above-mentioned problems, and its first objective is to provide a welding torch nozzle capable of expanding the shielding range. The second objective is to provide a welding torch nozzle that, in addition to the first objective, can improve accessibility and operability. [Means for solving the problem]

[0009] [1] The welding torch nozzle of the present disclosure is a cylindrical welding torch nozzle attached to the tip of a welding torch body, provided so as to surround a contact tip, and having openings at both ends, and includes a tip portion, a mounting portion attached to the welding torch body, and a main body portion connecting the tip portion and the mounting portion, wherein the tip of the tip portion is provided with a plurality of recessed grooves arranged at an even pitch around its entire circumference and extending toward the main body portion.

[0010] [2]:In the welding torch nozzle described in [1], the tip of the contact tip is exposed on the tip side of the opening end of the tip of the welding torch nozzle.

[0011] [3]: In the welding torch nozzle described in [1] or [2], the main body portion has a shape that narrows towards the tip, and the tip portion also has a shape that narrows towards the tip.

[0012] [4]: In the welding torch nozzle described in any of [1] to [3], the groove depth of the recessed groove toward the mounting portion is set to be greater than the opening width of the recessed groove at the opening of the tip portion. [Effects of the Invention]

[0013] The welding torch nozzle of this disclosure makes it possible to provide a welding torch nozzle that can expand the shielding range. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view of a welding torch equipped with a welding torch nozzle according to Embodiment 1. [Figure 2] This is a cross-sectional view taken along the line II-II in Figure 1. [Figure 3] This is an overall view of the welding torch nozzle according to Embodiment 1. [Figure 4] This is a cross-sectional view of the welding torch nozzle according to Embodiment 1. [Figure 5] This is an overall view of another embodiment of a welding torch nozzle from Embodiment 1. [Figure 6] This is a perspective view of another embodiment of the welding torch from Embodiment 1. [Figure 7] This is a perspective view of a welding torch equipped with a welding torch nozzle according to Embodiment 2. [Figure 8] This is an overall view of the welding torch nozzle of Embodiment 2. [Modes for carrying out the invention]

[0015] The welding torch nozzles of each embodiment will be described below with reference to the drawings. In the embodiments described below, when the number, quantity, etc. are mentioned, the scope of the present invention is not necessarily limited to the number, quantity, etc., unless otherwise specified. The same reference numeral will be used for the same part or equivalent part, and redundant descriptions may not be repeated. It is intended from the outset that the configurations in the embodiments will be used in appropriate combinations.

[0016] (Embodiment 1: Welding Torch 1 / Nozzle 13 for Welding Torch) Referring to FIGS. 1 to 3, the schematic configuration of the welding torch 1 will be described. FIG. 1 is a perspective view of the welding torch 1 equipped with the nozzle 13 for welding torch of the present embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an overall view of the nozzle 13 for welding torch.

[0017] Referring to FIGS. 1 and 2, this welding torch 1 illustrates, as an example, a welding torch used for "arc welding". This welding torch 1 includes a torch body 11 and a nozzle 13 for welding torch provided at the tip of the torch body 11. Inside the nozzle 13 for welding torch, a contact tip 12 is provided. The contact tip 12 is surrounded by the nozzle 13 for welding torch with a predetermined gap therebetween. Since the internal structure and mechanism of the welding torch 1 are the same as those of a conventional welding torch, detailed description thereof is omitted here. For example, it is equivalent to the welding torch disclosed in Japanese Patent Application Laid-Open No. 2004-90013 (Patent Document 1).

[0018] Referring to FIGS. 3 and 4, the configuration of the nozzle 13 for welding torch of the present embodiment will be described in detail below. FIG. 3 is an overall view of the nozzle 13 for welding torch of the present embodiment, and FIG. 4 is a sectional view of the nozzle 13 for welding torch.

[0019] The nozzle 13 for welding torch of the present embodiment has an overall shape of a substantially cylindrical shape with both ends open. The nozzle 13 for welding torch includes a tip portion 134, a mounting portion 131 mounted on the torch body 11, and a first main body portion 132 and a second main body portion 133 connecting the tip portion 134 and the mounting portion 131.

[0020] In this nozzle 13 for welding torch, the mounting portion 131 is provided with the largest diameter, and the mounting portion 131 is mounted on the tip portion of the torch body 11. The outer diameter of the mounting portion 131 is about 25 mm to 30 mm, and the inner diameter is about 21 mm to 26 mm. The axial length of the mounting portion 131 is about 10 mm.

[0021] The mounting portion 131 is connected to the first main body portion 132. The first main body portion 132 has a cylindrical shape with the same inner and outer diameters. The outer diameter of the first main body portion 132 is approximately 22 mm to 25 mm, and the inner diameter is approximately 18 mm to 21 mm. The axial length of the first main body portion 132 is approximately 25 mm.

[0022] The second main body 133 is connected to the first main body 133. The second main body 133 has a shape in which its inner and outer diameters gradually narrow towards the tip. The outer diameter of the second main body 133 on the side of the first main body 132 is approximately 22 mm to 25 mm, and its inner diameter is approximately 18 mm to 21 mm. The outer diameter of the second main body 133 on the side of the tip 134 is approximately 18 mm to 20 mm, and its inner diameter is approximately 14 mm to 16 mm. The axial length of the second main body 133 is approximately 35 mm.

[0023] The tip portion 134 is connected to the second main body portion 133. The tip portion 134 has a shape in which the inner and outer diameters gradually narrow towards the tip. The outer diameter of the tip portion 134 on the second main body portion 133 side is approximately 18 mm to 20 mm, and the inner diameter is approximately 14 mm to 16 mm. The outer diameter of the tip portion 134 on the tip side is approximately 14 mm to 18 mm, and the inner diameter is approximately 10 mm to 14 mm. The axial length of the tip portion 134 is approximately 10 mm.

[0024] Furthermore, the tip of the tip portion 134 is provided with a plurality of recessed grooves 134b arranged at an even pitch around its entire circumference and extending toward the second main body portion 133. In this embodiment, eight recessed grooves 134b are arranged at an even pitch. The groove depth D of the recessed grooves 134b toward the second main body portion 133 is approximately 3 mm to 7 mm. The opening width S1 of the recessed grooves 134b at the open end 134h of the tip portion 134 is approximately 1.5 mm to 3.5 mm.

[0025] In the case of this tip portion 134, the groove depth D of the recessed groove 134b toward the mounting portion 131 is greater than the opening width S1 of the recessed groove 134b at the open end 134h of the tip portion 134. The shape of each recessed groove 134b is such that the opening width of the recessed groove 134b narrows toward the second main body portion 133, and the bottom of the recessed groove 134b has a semicircular shape. For example, the recessed groove 134b can be formed using a tapered ball end mill used in cutting.

[0026] Referring again to Figure 1, in this embodiment, the welding torch nozzle 13 has the tip 12p of the contact tip 12 exposed from the open end 134h of the tip portion 134. The exposed length h is approximately 1 mm to 5 mm.

[0027] Referring to Figure 4, the flow of shielding gas G inside the welding torch nozzle 13 in a welding torch 1 using the welding torch nozzle 13 having the above configuration will be described. Figure 4 is a cross-sectional view of the welding torch nozzle 13.

[0028] With this welding torch nozzle 13, the shielding gas G that reaches the tip 134 expands and is ejected outward in the recessed groove 134b (arrow G2 in the figure). As a result, the gas shielding range at the tip of the welding torch nozzle 13 can be expanded.

[0029] Furthermore, as the internal gas flow path narrows towards the tip 134, the flow of the shielding gas G accelerates towards the tip. As a result, the shielding gas G's ability to block the outside air can be enhanced.

[0030] Furthermore, the tip 12p of the contact tip 12 is exposed from the open end 134h of the tip portion 134, and since this portion is sealed off from the outside air by the gas shield, the workpiece approach performance and operability can be improved. As a result, it becomes possible to maintain an appropriate torch angle and tip-base metal distance for the welding target (fillet weld, overlap weld, groove weld, etc.), enabling proper welding without generating blowholes or pits under sufficient gas shielding.

[0031] Furthermore, by adopting a design that narrows the internal gas flow path, the flow of shielding gas G can be accelerated towards the tip, making it possible to realize a welding torch nozzle with a shorter overall length. Using a welding torch nozzle with a shorter overall length improves accessibility to the workpiece.

[0032] (Nozzle 13B for other types of welding torches) Figure 5 shows an overall view of another embodiment of the welding torch nozzle 13B. Except for the largest diameter mounting portion 131, the main body portion 135 is formed in a cylindrical shape with the same inner and outer diameters. The outer and inner diameters of the main body portion 135 are the same as those of the first main body portion 132.

[0033] The main body 135 has an open end 134h on the tip side that is provided with a recessed groove 134b having the same shape as the welding torch nozzle 13. In this way, simply by providing a recessed groove 134b at the open end on the tip side of the welding torch nozzle, the shielding gas G that reaches the tip side can be expanded and ejected outwards in the recessed groove 134b. As a result, the gas shielding range at the tip of the welding torch nozzle 13 can be expanded.

[0034] (Other forms of welding torch 1A) Figure 6 shows another form of welding torch 1A. In the welding torch 1 shown in the above embodiment, the tip 12p of the contact tip 12 was exposed from the open end 134h of the tip 134 of the welding torch nozzle 13, but in this welding torch 1A, the tip 12p of the contact tip 12 is not exposed from the open end 134h. Even with this configuration, the shielding gas G that reaches the tip side expands and is ejected outward in the recessed groove 134b, thereby expanding the gas shielding range at the tip of the welding torch nozzle 13.

[0035] (Embodiment 2: Welding torch 1B / Welding torch nozzle 13B) Referring to Figures 7 and 8, the welding torch 1B and welding torch nozzle 13B in this embodiment will be described. Figure 7 is a perspective view of the welding torch 1B with the welding torch nozzle 13B attached, and Figure 8 is an overall view of the welding torch nozzle 13B.

[0036] The basic configuration is the same as that of the welding torch 1 and welding torch nozzle 13 in Embodiment 1 described above. The difference lies in the shape of the recessed groove 134b provided at the open end 134h of the tip portion 134 of the welding torch nozzle 13B. In Embodiment 1 described above, the recessed groove 134b was substantially U-shaped. On the other hand, the recessed groove 134b provided on the welding torch nozzle 13B in this embodiment is substantially triangular. As for the shape of the recessed groove 134b, the groove depth D toward the second main body portion 133 is approximately 2 mm to 6 mm. The opening width S1 of the recessed groove 134b at the open end 134h of the tip portion 134 is approximately 2 mm to 4 mm.

[0037] Even with this recessed groove 134b configuration, the shielding gas G expands and is ejected outward in the recessed groove 134b, similar to the welding torch nozzle 13 of Embodiment 1 described above. As a result, the gas shielding range at the tip of the welding torch nozzle 13B can be expanded.

[0038] In this case, when the shape of the recessed groove 134b is U-shaped, spatter is less likely to accumulate than when it is triangular. Furthermore, in the case of a U-shape, the angle toward the tip is gentler than in the case of a triangular shape, so it can be said that the turbulence intensity at the nozzle tip is lower than in the case of a triangular shape (the gas is less disturbed).

[0039] On the other hand, when the shape of the recessed groove 134b is triangular, the angle toward the tip is steeper than that of a U-shape, making it easier to achieve an expanded shielding range. However, the turbulence intensity at the nozzle tip is higher than that of a U-shape (the gas is more easily disturbed).

[0040] Although the above embodiments describe arc welding as an example, the present invention is not limited to "arc welding" and can also be applied to welding methods such as "electron beam welding," "laser welding," and "plasma arc welding."

[0041] While the welding torch nozzles of this disclosure have been described above, the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims, and all modifications are made within the meaning and scope of equivalents of the claims. [Explanation of Symbols]

[0042] 1,1A,1B Welding torch, 11 Torch body, 12 Contact tip, 12p Tip, 13,13B Nozzle for welding torch, 131 Mounting part, 132 First body part, 133 Second body part, 134 Tip part, 134b Recessed groove, 134h Open end, 135 Body part.

Claims

1. It is attached to the tip of the welding torch body and is positioned to surround the contact tip. A cylindrical welding torch nozzle with openings at both ends, The tip and, The mounting part that is attached to the welding torch body, A main body portion connecting the aforementioned tip portion and the aforementioned mounting portion, Includes, The tip of the aforementioned tip portion is provided with a plurality of recessed grooves arranged at an even pitch around its entire circumference and extending toward the main body portion. The main body comprises a first main body connected to the mounting portion and a second main body connected to the first main body, with the tip portion connected to the tip side. The first main body has a cylindrical shape with the same inner and outer diameters. The second main body has a shape in which the inner and outer diameters gradually narrow towards the tip. The aforementioned tip portion has a shape in which the inner and outer diameters gradually narrow towards the tip side. The aforementioned tip is more narrowed than the second main body. Nozzle for welding torch.

2. The tip of the contact tip is exposed on the tip side of the opening end of the tip of the welding torch nozzle. A welding torch nozzle according to claim 1.

3. The groove depth of the recessed groove toward the mounting portion is, The opening of the recessed groove at the tip portion is provided to be larger than the opening width of the recessed groove. A welding torch nozzle according to claim 1.

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