JPS61196707A - Connector welding for inorganic insulation cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a connector welding method for inorganic insulated cables.
In particular, this prevents welding defects from occurring due to variations in the penetration depth of the sheath.

[Conventional technology]

In general, connector welding of inorganic insulated cables is performed by connecting the metal sheath (2) of the inorganic insulated cable (1) to the inorganic insulated cable (1) as shown in Figure 6.
A metal connector (5) is sheathed on top, and the connector (5)
) and the sheath (2) are welded by TIG, plasma, laser, etc. In the top view, (3) is the conductor of the inorganic insulated cable (1), and (4) is the sheath (2) and conductor (3).
) is filled with MoO powder, and (6) indicates a welding torch.

[Problem that the invention seeks to solve]

The metal sheath of an inorganic insulated cable is thin, so when welding the sheath and the connector on the sheath, even if the welding conditions are constant, it is important to control the penetration depth during welding within the sheath thickness due to workpiece accuracy and heat accumulation. It is difficult to do so, and has the drawback of causing poor welding. In other words, the air between the M(10 powders) inside the sheath expands due to the welding heat, and the water adsorbed on the surface of the M(10 powders) evaporates, increasing the pressure inside the sheath, and as a result, the sheath melts. When the depth reaches the thickness of the sheath, the molten part is blown away by the internal pressure of the sheath, resulting in defective welding.

Furthermore, if the penetration depth of the sheath is small, an unfused portion will be formed in the weld between the sheath and the end of the connector, resulting in poor welding.

1 Means for Solving Problem C] In view of this, the present invention has developed, as a result of various studies, a connector welding method for inorganic insulated cables that can prevent the occurrence of welding defects due to variations in the penetration depth of the sheath. In a method in which a metal connector is sheathed on a metal sheath of an inorganic insulated cable and the connector end and sheath are welded using a laser, a side surface that is 0.1 to 1.0 mm higher than the sheath surface of the connector end, It is characterized in that the laser beam is irradiated at an angle of 10 to 60 degrees with respect to the cable axis, and the penetration depth of the sheath is set to the depth of the sheath - X.

That is, the present invention provides an inorganic insulated cable (1
), a metal connector (5) is sheathed on the sheath (2) of the
As shown in Figure 2, the sheath (2) at the end of the connector (5)
) on the side surface where h) is 0.1 to 1.0 mm higher than the surface,
Irradiate the sea 1f beam (7) whose angle (θ) with the axis of the cable (1) is inclined from 10 to 60 degrees, and increase the penetration depth D of the sheath (2) to the thickness of the sheath (2). The ends of the sheath (2) and connector (5) are welded together by adjusting the ends of the sheath (2) and connector (5).
A device capable of producing 8) at high speed, that is, a device capable of generating a minute spot-like laser beam (7) with high energy density, is used. In the figure, (9) indicates a nozzle that emits the laser beam.

[For production]

As described above, the present invention connects the laser beam to the cable axis and
By irradiating at an inclination angle of 60 degrees, a sufficient amount of penetration for welding can be obtained at a shallow depth (including J), and the penetration depth can be easily controlled.

However, the reason for limiting the inclination angle of the laser beam to 10 to 60 degrees is that if the angle is less than 10 degrees, it will not only be difficult to hold the nozzle due to dimensions, but also cause variations in the penetration depth of the sheath due to cable shaking during welding. If the angle exceeds 60 degrees, the penetration depth may reach the sheath thickness due to variations in the penetration depth of the sheath due to cable shaking during welding, and the weld may melt. This is because any of the above may cause welding defects, such as parts being blown out by the internal pressure of the sheath.

Also, the irradiation position of the laser beam is set 0.1 to 1.0 mm from the sheath surface of the connector end. Omm high side is defined as the reason that due to cable shaking during welding, etc., the penetration depth of the sheath may reach the sheath thickness at a height of less than 0 mm, and when the height exceeds 1.0 mm. This is because both cause welding defects, such as the formation of unfused areas in the welded area.

In addition, the penetration depth of the sheath is limited to the sheath thickness ~y because the penetration depth varies due to cable shaking during welding, and if it is less than χ, an unfused part will occur in the welded part.
This is because if X is exceeded, the penetration depth of the sheath may reach the thickness of the sheath, and any of these may cause welding defects.

〔Example〕

As shown in Figure 1, the thickness of the inorganic insulated cable is 0.4 mm.
A connector with an end wall thickness of 0.75 mm is mounted on a metal sheath, and as shown in Fig. 2, the beam inclination angle θ and the height of the irradiation position from the sheath surface are determined.

The sheath and the connector end were welded by laser while changing the penetration depth D of the sheath. A carbon dioxide laser device with a capacity of IKW was used as the laser, and typical results are shown in FIGS. 3 to 5.

Figure 3 (a), (b), and (c) have an average output of 500W,
This shows the results of welding at a welding speed of 1.8 m/min, with the irradiation position (height h from the sheath surface) of the beam (7) being constant (0.3 m), and the inclination of the beam (7) This shows the case when the angle θ is changed. As shown, when the inclination angle θ is 30 degrees, the melt bead (8) becomes approximately the thickness of the sheath (2), and in detail, it can be seen that good results are obtained when the angle θ is 10 to 60 degrees. As shown in (A), the inclination angle θ is 70 degrees, more specifically, at an angle exceeding 60 degrees, the weld bead (8) reaches the thickness of the sheath (2), and as shown in (C), the inclination angle θ is It can be seen that when the angle is less than 7 degrees, more specifically, less than 10 degrees, the depth of the weld bead (8) is shallow and an unfused portion is formed in the weld.

In addition, Fig. 4 (a), (b), and (c) show welding speeds of 1.8
m/min, and shows the results of varying the output up to 1KW, with the inclination angle θ of the beam (7) being constant (30 degrees), and the irradiation position of the beam (7) (height h from the sheath surface). (A) shows the case where h is changed to Omm,
(b) h is 0.5mm, (c) h is 1.2mm
As is clear from (b), h is 0.
, 51Bm, the weld bead (8) becomes the sheath (2
), and in detail, h is approximately 0.1 to 1. om
It can be seen that good results can be obtained within the range of m. On the other hand, as shown in A), h is omm, more specifically, h is 0.
If it is less than 1 mm, the welding area is small and the welding strength is low (
As shown in c), h is 1.2 mm, specifically h is 1.
If it exceeds omm, the depth of the weld bead (8) will be shallow.
It can be seen that an unmelted part is formed in the welded part.

Furthermore, Fig. 5 (a), <mouth), and (c) show welding speed of 1.8.
This shows the results obtained by changing the inclination angle θ of the beam (7) within the range of 10 to 60 degrees, and changing the irradiation position of the beam (7) (height [1] from the sheath surface). 0.1
This shows the case where the depth of the penetration beat (8) is avoided by changing the depth of the welding beat (8) by changing it within the range of ~i, omm and further changing the output of the laser beam.
, the depth D of the penetration bead is 0.07 m, (b) is θ of 30 degrees, h is 0.5 mm, D is 0.2 mm, (c) is θ of 60 degrees, h is 0.5 mm, D is 0.35mm
As is clear from (b), D is o
, 2 mm, specifically D is the thickness of the sheath (2) x ~
It can be seen that good welding can be obtained at X. On the other hand, as shown in A), θ is 10 degrees and 2h is 0.2 mm.

If D is 0.07 mm, specifically, if D is less than the thickness of the sheath (2), an unfused part will occur in the weld, and as shown in (c), θ is 60 degrees, h is 0.3 mm, and D is less than the thickness of the sheath (2). 0.35mm,
Specifically, when D exceeds the thickness of the sheath (2), some of the weld beads (8) reach the thickness of the sheath (2), which may cause blow-off due to the internal pressure of the sheath (2). I understand.

〔Effect of the invention〕

As described above, according to the present invention, in connector welding of inorganic insulated cables, the laser beam is connected to the cable axis by 10 to 6
By tilting it at 0 degrees and irradiating the side surface of the connector end 0.1 to 1.0 mm higher than the sheath surface and controlling the penetration depth of the sheath to the thickness of the sheath,
This can prevent welding defects due to variations in sheath penetration depth due to cable shaking during welding, etc., and has a remarkable effect on beams.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of the welding method of the present invention. FIG. 2 is an explanatory diagram showing a main part of FIG. 1 in an enlarged manner. Figures 3 (a), (b), and (c) show the effects of the inclination angle of beam irradiation; (a) shows the inclination angle -9 = 70 degrees; C) is an explanatory diagram showing the case where the inclination angle is 7 degrees, and FIG. 4 (A). (b) and (c) show the influence of the beam irradiation position.
(A) is Omm from the sheath surface, C port) is 0mm from the sheath surface
．． 5 mm, (C) is an explanatory diagram showing the case of 1 or 2 mm from the sheath surface, and FIG. 5 (A). (b) and (c) show the influence of the sheath penetration depth, and (a) shows the influence of the sheath penetration depth of 0.07. mm. (b) is an explanatory diagram showing a case where the welding depth is 0.2 mm, (c) is an explanatory diagram showing a case where the welding depth is 0.35 m, and FIG. 6 is an explanatory diagram showing an example of a conventional welding method. 1. Inorganic insulated cable 2. Sheath 3, conductor 4. IvloO powder 5, connector 6.1~-chia, laser beam 8. Weld bead 9, laser beam

Claims (1)

[Claims] In a method in which a metal connector is sheathed on a metal sheath of an inorganic insulated cable and the end of the connector and sheath are welded by laser, 0.1
An inorganic product characterized by irradiating the side surface with a height of ~1.0 mm with a laser beam at an angle of 10 to 60 degrees with respect to the cable axis, and making the penetration depth of the sheath 1/4 to 3/4 of the thickness of the sheath. Connector welding method for insulated cables.