JPH0588777U - Spot Weld Nugget Monitor-Probe - Google Patents

Abstract

(57) [Summary] [Purpose] By making the probe movable in the case, the entire welding nugget of the spot weld can be detected in a liquid-tight state without moving the case, and the case can be detected. The present invention aims to provide a probe for a spot welding nugget monitor which can easily remove liquid bubbles generated in the probe and accumulated in the concave surface of the tip of the probe for accurate detection. [Structure] In a probe for a spot welding nugget monitor that projects an ultrasonic pulse to a spot welding spot, a collar 4 is formed on the outer periphery of a probe holder 3 that holds the probe 1, and a probe is formed. The case 2 is formed with a groove 7 through which the collar can slide forward, backward, leftward and rightward, and the case 2 is formed with a liquid supply passage 10 directed to the concave surface 12 at the tip of the probe. A probe for a spot welding nugget monitor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a monitor probe for determining the quality of a weld nugget in a spot weld portion by nondestructive inspection.

[0002]

[Prior Art]

 In order to determine the quality of the weld nugget at the spot welded portion by non-destructive inspection, one using a probe that projects an ultrasonic pulse to the spot welded portion is disclosed in, for example, Japanese Utility Model Laid-Open No. 61-181369. It is known.

[0003]

[Problems to be solved by the device]

 By the way, in the ultrasonic probe as described above, since the probe is fixed in the case, only one point can be searched. There is a problem that the case must move in a circular or spiral locus to the front, rear, left and right, and the liquid in the case leaks along with the movement and interferes with detection.

At the time of the exploration, a liquid is supplied into the case so as to form a passage of an ultrasonic pulse. Bubbles generated from the liquid in the case cause the tip of the probe to move. There is also a problem that the bubbles accumulate in the concave surface and the progress of the sound wave of the pulse is hindered by the bubbles, so that accurate detection cannot be performed.

The present invention has been made in view of the above problems of the prior art, and its purpose is to make the probe movable in the case. The entire weld nugget of the spot weld can be detected in a liquid-tight state without moving the squirrel, and the liquid bubbles accumulated in the concave surface at the tip of the probe generated in the case can be easily erased to accurately It is intended to provide a probe for a spot welding nugget monitor capable of detecting.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a probe for a spot welding nugget monitor according to the present invention is provided with a collar on the outer periphery of a probe holder for holding a probe, and the case of the probe is provided with the collar. Is characterized in that a groove which can be slid forward, backward, leftward and rightward is formed.

According to a second aspect of the present invention, in addition to the above configuration, a seal O-ring is provided at the tip of the case.

Further, in a third aspect of the present invention, in addition to the configuration of the second aspect, a case is provided with a liquid supply path directed to the concave surface at the tip of the probe.

[0009]

[Action]

 In the probe for spot welding nugget monitor configured as described above, the case is installed on the spot welding portion of the spot-welded welding member, and the probe is supplied while supplying the liquid from the liquid supply passage. The child detects the nugget. When the detection of one point is completed, the probe is moved in the forward, backward, leftward, and rightward in the case while keeping the case as it is, so that the probe has a circular or spiral locus. The entire spot weld is detected while moving. In this way, the entire image of the nugget can be detected without liquid leakage from the case during detection, and liquid bubbles generated in the case and accumulated in the concave surface of the tip of the probe are Since the liquid supplied inside is directed to the concave surface of the tip of the probe and hits the liquid bubble, the liquid bubble is erased here.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a probe held by a probe holder 3 in a case 2. The probe 1 is connected to an ultrasonic pulse transmitter and an oscilloscope (not shown). There is.

The probe holder 3 is formed with an annular flange 4 over the entire circumference in the radial direction, and a cap screw 5 for connecting a bracket 20 described later is arranged at the upper end. An O-ring 6 for keeping liquid honey is arranged between the probe 1 and the probe 1.

The case 2 is formed with an annular groove 7 that is open upward so that the collar 4 can slide forward, backward, leftward and rightward, and a lower end of a hollow portion 8 that houses the probe holder 3. Is open, and an O-ring 9 is disposed on the lower end of the spot welding portion of the welding member, which is the object to be detected, so as to be in close contact with liquid honey. Further, 10 is a liquid supply passage for supplying a liquid such as water into the hollow portion 8, 11 is a liquid discharge passage for discharging the liquid, and both passages 10 and 11 are cases 2 And is directed to the concave surface 12 at the tip of the probe 1. In addition, 13 is an O-ring for keeping liquid between the case 2 and the collar 4, 14 is a lid for covering the groove 7 of the case 2 from above, and 15 is the probe 1 for the probe. It is a packing for fixing to the holder 3.

Then, as shown in FIG. 2, a first moving body 18 having a roll 17 on the substrate 16 and a roll on the roll 17 intersecting the roll at a right angle. And a second moving body 19 in which the brackets 20 are arranged. One end of a bracket 20 is fixed to the upper surface of the second moving body 19, and the other end of the bracket 20 is the cap screw. It is connected to the probe holding body 3 via 5.

In the embodiment having the above-mentioned structure, the case 3 is installed in the form of honey on the spot-welded portion of the spot-welded welding member, and, for example, water is supplied from the liquid supply passage 10. When an ultrasonic pulse from the ultrasonic pulse generator is sent to the probe 1, the pulse is emitted from the concave surface 12 at the tip of the probe 1 as a focused type, and water in the middle is used as a pulse passage. When it reaches the nugget, it is reflected and reaches the concave surface 12, and is displayed on the oscilloscope through the probe 1 and the ultrasonic pulse generator.

In this way, when a part of the nugget portion is detected, the first moving body 18 or the second moving body 19 on the substrate 16 is operated to move the bracket 20 sequentially back and forth or left and right. As a result, the collar 4 of the probe holder 3 slides back and forth or left and right in the groove 7 of the case 3, and as a result, the case 3 is fixed in the case 3 while being fixed. The tentacle 1 moves back and forth or left and right in a circular or spiral locus to search the entire nugget portion and detect the entire image of the nugget portion.

During this detection, water is constantly supplied from the liquid supply passage 10 and discharged from the liquid discharge passage 11, and the hollow portion 8 is filled with water, so that the pulse progresses reliably. The liquid bubbles generated in the hollow portion 8 and accumulated in the concave surface 12 at the tip of the probe 1 are such that the liquid supplied to the hollow portion 8 is directed to the concave surface 12 at the tip of the probe 1 and hits the liquid bubbles. Therefore, the liquid bubbles are erased here, and there are no bubbles in the hollow portion 8. The collar provided on the outer circumference of the probe holder 3 and the groove provided on the case of the probe are not limited to the annular circle but may be polygonal.

[0017]

[Effect of the device]

 Since the present invention is configured as described above, it is possible to detect the entire image of the nugget part by moving the probe while fixing the case at a fixed position, and with the movement of the case. The leakage of liquid is prevented and it becomes possible to know the exact whole picture of the nugget.

In addition to the above effect, in the second aspect, since there is no liquid leakage while detecting the entire image of the nugget portion, it is possible to know the more accurate entire image of the nugget.

Further, in addition to the above effects, in the third aspect, the progress of the sound wave of the pulse due to the liquid bubbles is not obstructed during the detection of the entire image of the nugget portion, and the more accurate entire image of the nugget can be known. It will be possible.

[Brief description of drawings]

FIG. 1 is a sectional view of a spot welding nugget monitor-probe according to the present invention.

FIG. 2 is a perspective view of a spot welding nugget monitor-probe and an operating machine for operating the probe according to the present invention.

[Explanation of symbols]

 1 probe 2 case 3 probe holder 4 collar 7 groove 9 0 ring 10 liquid supply path 12 concave surface

Claims (3)

[Scope of utility model registration request] 1. A probe for a spot welding nugget monitor for projecting an ultrasonic pulse to a spot welding spot, wherein a collar is provided on the outer periphery of a probe holder for holding the probe, and a probe case is provided. A probe for a spot welding nugget monitor, characterized in that a groove in which the collar is slidable forward, backward, leftward and rightward is formed on the sleeve. 2. A probe for a spot welding nugget monitor according to claim 1, wherein a zero ring for a seal is arranged at the tip of the case. 3. The probe for a spot welding nugget monitor according to claim 2, wherein a liquid supply path is formed in the case so as to be directed to the concave surface of the tip of the probe.