JPS61247940A - Inspecting instrument for welding strength of stud - Google Patents

Abstract

PURPOSE:To inspect the welding strength of a stud easily in a short time by inserting a head into a stud, and swiveling a lever and performing the inspection. CONSTITUTION:A welding strength inspecting instrument for the stud consists of the head 1 and the lever 2 linked to the head 1 in a swiveling state. The head 1 has a hole bored at its one end and the shaft part 4 of the stud 3 is put therein; and the lever 2 is coupled with the head 1 at its intermediate position through a pin 5 and swivels between position (A) and (B). This swivel applies a force to the tip of the head 1 in the opposite direction of the swiveling direction to apply the shaft 4 with a force for separation from a base material 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for testing the weld strength of a weld of a welded stud.

Conventional technology Currently, in order to test the weld strength of the welded part of a stud actually welded to the base metal, two methods are used: a blow test method in which the stud is struck from the side with a hammer, etc., and a bending test method, in which the stud is bent with pliers, etc. ing. In the case of threaded studs, there is also a method of preparing a test nut and tightening it with a torque wrench to determine the weld strength.

Problems to be Solved by the Invention Although the above-mentioned impact inspection method is simple, it is difficult to keep the impact force constant, and the impact during impact may damage or bend the stud side surface. When the base material is a thin plate, the base material may be deformed.

In addition, the bending inspection method is preferable to the impact inspection method because there is no impact, but there is a possibility that the stud shaft may be damaged or bent, and in the case of a thin plate base material, the base material is deformed by the bending test, so it is necessary to inspect all of the specimens. There is a disadvantage that it cannot be done. Furthermore, the screw tightening test method for threaded studs is superior to the three methods mentioned above because no bending force is applied, but it can only be applied to threaded studs and requires a large number of test nuts for various studs. There are disadvantages in that it requires preparation, takes a lot of testing time, and is difficult to test all the items.

Therefore, it is an object of the present invention to provide a method that can be used without damaging or bending the stud or the base material, regardless of the type, shape, or size of the stud.
To provide a stud welding strength testing device that can easily test all studs.

Means for Solving the Problems In order to achieve the above object, the present invention provides a head in which a hole for receiving a stud is formed at one end and a protruding end at the other end, and a pivotable head at an intermediate position of the head via a pin. and a lever which is disposed within the lever and is provided with a compression spring and a piston pushed towards the other end of the head by the compression spring so that the axis of the lever is aligned with respect to the head. A stud welding strength testing device characterized in that when the pistons are raised so as to coincide, the tip of the piston contacts and presses the other end of the head, and this reaction force is applied to the one end of the head using the connecting pin as a fulcrum. is provided.

Therefore, the inspector inserts the tip of the head into the stud and
The welding strength of studs can be tested by simply raising the lever. In other words, if the stud does not separate from the base metal and remains welded when the lever is raised, the welding is good; if the stud separates from the base metal, the weld is defective.
You can know whether re-welding is necessary.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. 1 and 2, the stud welding strength testing device according to the present invention comprises a head 1 and a lever 2 pivotally connected to the head 1. As shown in FIGS. The head 1 has a hole formed at one end thereof to receive the shaft portion 4 of the stud 3, and the lever 2 is connected to the head l at an intermediate position via a pin 5, so that the lever 2 is connected to the head l at an intermediate position via a pin 5, and is arranged in positions A and B in FIG. This rotation applies a force to the tip of the head 1 in a direction opposite to the direction of rotation, and applies a force to the shaft portion 4 of the stud 3 to cause it to separate from the base material 6.

The head 1 has a stud receiving hole 12 at its tip 11, a pin 5 for connection with the lever 2 passes through it at an intermediate position, and the other end (that is, the upper end) 13 projects upward. The other end 13 is preferably rounded as shown in FIG. 2 on the pivoting surface of the lever, so that the lever pivots smoothly in both reciprocating strokes.

Note that it is preferable that the tip 11 be configured so that it can be replaced according to the size and shape of the stud. In this case, several tip parts may be prepared, and they may be fixed and removed using screws 14 or the like.

The lever 2 includes a cylindrical main body 16, a pair of bifurcated plates 17 and 17 forming a connection to the head 1, and a grip 18 at the free end.
A compression spring 20 and a piston 21 pushed toward the other end 13 of the head 1 by the spring are provided inside the cylindrical body 16, and the tip 22 of the piston 21 is pushed toward the other end 13 of the head 1. is being pushed towards. compression spring 2
0 pushes the piston 21, so the rear end is the stopper 2.
3, and this stopper 23 has on its side,
It is preferable to form a male thread corresponding to the female thread on the inner surface of the main body 16, so that the pressing force of the compression spring can be adjusted. In other words, the stopper 23 acts as an adjustment screw.

Furthermore, in order to visually display the strength of this compression pressure, a window 24 (Fig. 2) is provided on the side of the cylindrical body 16, and a pointer indicating the test load that is linked to the stopper 23 is provided, and the edge of the window is provided. A scale may be provided. A flange 25 is provided inside the main body of the piston 21 and determines the protruding length of the tip 22 of the piston.
It is sufficient that the lever 2 contacts the other end 13 of the head 1 at a certain angle when the lever 2 is turned to the position B, and moves back a little when the lever 2 comes directly above the head 1. Further, it is preferable that the piston tip 22 be rounded like the other end 13 of the head.

A pair of plates 17, 17 constituting the bifurcated connecting portion have one end fixed to the lever body 16 by screws 27, 27, etc., and a boss 28 for receiving the connecting pin 5 formed at the other end. Preferably, a pin 30.31 is provided on the plate 17 and the other end 13 of the head 1, and a tension spring 32 is preferably provided between the pins 30.31, which pulls the plate 17 with a weak force.

Thereby, the positions of the piston tip 22 and the other end 13 of the head are maintained at the A position (or B position) shown in FIG. 2, and inspection work can be performed immediately.

In operation, the stud shaft 4 is inserted through the hole 12 of the tip 11 of the head 1, and the grip 18 of the lever 2 is held and turned from the A position to the B position in FIG. 2.

During this rotation, the piston tip 22 of the lever 2 comes into contact with the other end 13 of the head 1 and begins to press it. This pressing force applies a force in the opposite direction to the head tip 11 as a reaction force using the connecting pin 5 as a fulcrum, and applies a force in the opposite direction to the side of the shaft 4 of the stud 3.
A peeling force is applied to the base material 6. As the rotation continues, this peeling force continues to be applied to the stud 3, and when the piston tip 22 separates from the other end 13 of the head, the peeling force disappears.

The peeling force is determined by the pressing force of the piston 21 against the other end of the head 13 by the compression spring 20, and can be adjusted by the position of the stopper 23.
The test load of the stud to be tested can be determined.

For this adjustment, the grip 18 is preferably screwed to the main body 16, and the grip 18 can be removed and turned by applying a screwdriver or the like to the groove 33 on the top surface of the stopper. In addition, window 24
It is preferable to inscribe the test load or stud size, which further facilitates adjustment.

After setting the test load, put the head 1 into the stud 3 and turn the lever 2 from position A to position B. If the stud 3 remains connected to the base metal 6 after turning, the welding strength is sufficiently good. It is determined that However, if the stud 3 peels off from the base metal 6 during turning, it can be determined that welding is defective, and re-welding can be instructed. In addition, when performing inspection work by turning from position A to position B,
The next inspection can be carried out from position B to position A, and by moving it back and forth, inspection can be carried out from two directions at once.

Effects of the Invention According to the present invention, the welding strength of a stud can be tested with the simple operation of inserting the head into the stud and turning the lever.The test load is always maintained constant, so it is possible to test the welding strength of the stud. Since the studs are not deformed and the studs are not bent or hit, the studs are not damaged, and furthermore, all studs can be easily inspected in a short amount of time.

[Brief explanation of the drawing]

FIG. 1 is a partial side sectional view of a stud welding strength testing device according to the present invention, and FIG. 2 is a partially cutaway front view showing the operation of the device according to the present invention. 1...Head, 2...Lever, 3...Stud, 5...Connecting pin, 6...Base material,
11... One end of the head, 13... The other end of the head,
16...Lever body, 17...Plate,
18...Grip, 20...Compression spring,
21... Piston 23... Stopper,
32...Tension spring. Fig. 1 20: Compression bone 32: Tension bone

Claims (5)

[Claims] (1) In a device for testing the welding strength of a stud welded to a base metal, a hole is formed at one end to receive the stud,
It consists of a head with the other end protruding, and a lever pivotally connected to the intermediate position of the head via a pin, the lever has a compression spring inside it, and the compression spring connects the lever to the other end of the head. When the lever is raised so that its axis coincides with the head, the tip of the piston contacts and presses the other end of the head, and this reaction force causes the connecting pin to serve as a fulcrum. A device, characterized in that it is added to said one end of the head as a. (2) The device according to claim 1, wherein the lever is provided with an adjustment screw for adjusting the compression force of the compression spring. (3) The device according to claim 1, wherein a grip is attached to the free end of the lever. (4) The connecting portion of the lever to the head is formed into a bifurcated shape, and the other end of the head extends between the two, and the other end of the head and the lever connecting portion are provided with a tension spring that draws them together with a weak force. An apparatus according to claim 1, wherein the apparatus is provided with: (5) The device according to claim 1, wherein the tip of the head is replaceable according to the shape and size of the stud.