JPS60191676A - Method for joining lower cap of shock absorber and fitting member to other member - Google Patents

Abstract

PURPOSE:To improve joining strength of a lower cap and a fitting member by generating an arc between a sealed pin covered with shield gas and the fitting member, and bringing the fitting member into contact with a formed molten pool and joining it. CONSTITUTION:Shield gas 14 is spouted from a nozzle 12 to shield the lower cap 2 and fitting member 5 from air. Current is applied from a welding power source 11, and at the same time, the fitting member 5 which is in contact with the sealed pin 3 is separated by upward movement of an upper electrode 9, and an arc 19 is generated between them. The sealed pin 3 and fitting member 5 are molten and a molten pool part 20 and a molten part 21 are formed. However, generation of blowholes etc. is prevented by sealing of the shield gas 14. The molten pool 20 is brought into contact with the molten part 21 of the fitting member by downward movement of the upper electrode 9, and joining is performed after stopping current and spouting of shield gas 14. Joining free from defects such as blowholes etc. can be made by this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of joining a lower cap of a shock absorber and a mounting member to another member.

[Background of the invention]

First, a conventional joining method will be explained based on FIG. In the figure, 1 is the main body of the shock absorber, 2 is the lower cap, the filter is an enclosed pin, 4 is an enclosed gas, and 5 is a ring-shaped part for attachment to other members. Conventionally, the lower cap 2 and the multilayer member 5 have been joined by resistance welding such as projection welding.

However, with such a lower cap 2 and a number of parts 5, nuggets are not formed, and the bonding area cannot be simply increased by 17, so the bonding strength is low and the durability is low. In addition, in the case of resistance bath finishing, burrs 6 are formed during bonding, resulting in geometrical notches, which further reduces the ablation property. Therefore, the lower cap 2 and the multi-layer member 5 are joined by resistance welding, and then reinforced by carbon dioxide arc welding (not shown), but in this case, the number of steps increases and the cost increases. There is a drawback of uploading.

The method of joining only by carbon dioxide gas arc welding without using resistance welding is, in manufacturing the shock absorber, after injecting a few atmospheres of gas into a part of the cylinder, press-fitting the filling bottle, and connecting the lower cap and the bottom cap around the filling pin. Since the mounting member is welded, there is a risk that the press fit of the enclosing pin may loosen due to the heat during welding, and the enclosing gas may leak out during welding.

A welding method called stud welding, in which studs such as steel rods are planted in the base material instead of bolts, is used in large-scale construction and civil engineering fields (Japanese Patent Laid-Open Publication No. 126081/1981, etc.)
However, this welding method requires a Niferrule or cartridge for each stat, so although the welding strength is strong, it requires a process to break and remove each ferrule after welding is completed.
This overcomes the drawback that the work is time-consuming. However, if the base material surface is not flat but curved,
The reality is that stud welding cannot be used because it is difficult to attach the ferrule to the base metal, or the ferrule is very expensive.

[Purpose of the invention]

The present invention has been developed in view of the above circumstances, and it has strong bonding strength, can easily increase the bonding area, improves durability, and has high impact resistance. There is no risk of the sealed gas leaking out during welding, and the shock absorber lower cap and other parts have several parts that simplify welding work and prevent the occurrence of blowholes. Confession<r provides a method for joining.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention covers the inner joint portion between the lower cap and the attachment portion to another member with a shielding gas, and protrudes outward from the lower cap. Generate an arc between several parts and lower cap, enclosure bottle? gl? After forming l1li pond,
It is characterized in that several members are brought into contact with the molten pool and joined.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

Fig. 2 is a partially cutaway side view showing the state before welding in the welding method according to the present invention, Fig. 3 is a side view of a main part shown in cross section showing when an arc occurs according to the present invention, and Fig. 4 The figure is IV of Figure 5.
-IV line sectional view, Fig. 5 is a side view of the main part showing the state after joining according to the present invention, partially in cross section, and Fig. 6 shows the welding current and the state of contact and separation between the lower cap and the mounting member. , is a diagram showing the Saka J section of shield gas blowout. The lower camp 2 is joined to the main body 7 of the shock absorber 1, and is connected to the lower electrode 15 via the main body 7. The enclosure bottle 5 is press-fitted into the lower cap 2 so as to protrude outward. Inside the lower cap 2 (the sealed gas 4 is already filled in).

The ring-shaped member 5 is connected to the upper electrode 9 by a hook 8.
Fixed. (2) The lower electrode 9 is connected to a welding gun 10 and further connected to a welding DC power source 11. A solenoid (not shown) is installed inside the welding gun 10 and moves the upper electrode 7 up and down to move the mounting member 5 into the enclosure bottle 6.
It is configured to move toward and away from the The upper mold $i9 and the mounting member 5 are surrounded by a nozzle 12. Reference numeral 15 indicates a supply port for a shielding gas 14 such as argon or a mixed gas of argon and carbon dioxide.

As shown in FIG. 6, the welding current 16, the upward movement state 17 of the upper electrode 9, and the ejection state 18 of the shielding gas 14 are controlled to operate in a correlated manner.Next, a detailed description of the present invention will be described. do. First, shield gas 14
is ejected from the nozzle 12 (5 to 10 l/mtn') to shield the lower cap 2 and the mounting part 5 from the air. After that, the welding DC power source 11 starts to be energized and welding current (1000 to 20 [l0A) is applied], and at the same time,
The mounting member 5 in contact with the enclosing pin 5 is separated by moving the upper mold 41q upward using a solenoid,
An arc 19 (see Figure 6) is generated between the two (0.
2-2 seconds). Since the enclosing pin is in the protruding state, the arc 19 is easily generated starting from the enclosing pin.

The heat of the arc 19 melts the lower cap 2, the enclosing pin 3, and the mounting part 5, forming a molten pool 20 and a molten part 21. At this time, since the molten pool 20 and the molten zone 21 are shielded by the shielding gas 14, welding defects (metal deterioration) and blowholes due to oxidation of the molten metal are prevented from occurring. After that, the upper electrode 9 is connected to the solenoid.
The melted part 21 of the mounting member 5 and the lower cap 2 are moved downward.
and the molten pool 20 , the supply of electricity from the welding DC power source 11 is stopped, and the ejection of the shielding gas 114 is stopped. This completes the joining. It should be noted that there is no problem in terminating the energization even before the molten pool 20 and the molten part 21 come into contact with each other, as long as the molten metal does not start vertical drawing. However, it is better to end the energization after the contact with the blowhole. It is preferable to provide a post-heating time 22 (see FIG. 6) of about 0.01 to 0.04 seconds because the occurrence can be more reliably prevented by one layer.

Note that it is necessary to change the welding current according to the above-mentioned welding current of 1000 to 200 OA, arc time of 0.2 to 2 seconds, type of material of the lower cap, plate thickness, etc.

Specific examples are shown below.

Example: The lower cap is made of steel plate with a thickness of 5.2 mtn, the mounting member is also made of carbon steel with a thickness of 5 mm, and a ring with an outer diameter of 50 mm, the enclosure bottle is made of carbon steel with a diameter of 5 mm, a length of 5 mm, and a welding current of 1400 A. , an optimal bonding could be achieved with an arc time of 0.25 seconds. Welding current or arc time is 180OA
, when it gets longer than 0.4 seconds, the lower cap melts and falls off.
In addition, due to the increase in strain, a large amount of sealed gas leaked, and the 1000A, 0
．． ．． When the time was 2 seconds or less, the molten pool became non-uniform and the bonding strength was weak. Also, by reducing the welding current by 140OA or by shortening the arc time by 0.25 seconds, the joint area can be made smaller, and by creating the opposite relationship, the weld surface area can be made larger. I was able to do that.

Figure 2 shows another embodiment of the present invention.
The tip of ' is formed in the shape of a circle β, making it easier to generate an arc.

As shown diagonally above, the joining method according to the present invention covers both the liquid joining portions of the lower cap 2 of the shock absorber and the attachment member 5 to other members with the shielding gas 14, and the outer part of the lower cap 2. An arc 19 is generated between the enclosed bottle 5 protruding from the top and the above-mentioned member 5 to form a molten pool 20 in the lower cap 2, a molten pool 20 in the enclosed bottle 5, and a molten part 21 in the mounting member 5. The molten pool 20 and the molten part 21 are brought into contact with each other and joined.

〔Effect of the invention〕

According to the present invention, after forming a molten pool, the lower cap and the mounting member are joined by contacting, so that the joint strength is strong and the welding temperature can be adjusted by adjusting the welding current and arc time. Since the size of the pond can be changed, the joint area can be easily increased and the durability can be increased.

In addition, since it does not cause the damage that occurs in the past, it is also possible to improve the @ impact resistance. Furthermore, the arc time is short,
Distortion can be prevented by setting optimal welding conditions according to the material and plate thickness of the lower cap, etc.

This makes it possible to completely eliminate leakage of the injection gas during welding work. Compared to stud welding, since ferrules and the like are not required, welding can be performed easily and at low cost, and blowholes can also be prevented from occurring due to the ejection of shielding gas.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of the main part showing a conventional example, Fig. 2 is a partially cutaway side view showing the state before joining of the joining method according to the present invention, and Fig. 5 is a side view of the main part with a partial cutaway showing the state before joining of the joining method according to the present invention. A side view of the band part showing the time in cross section, Fig. 4 is IV-IV of Fig. 3.
A line sectional view, FIG. 5 is a side view of a main part showing a state after joining according to the present invention, partially in cross section, and FIG. Shield gas "r"
FIG. 7 is a diagram showing the relationship of L output, and FIG. 7 is a sectional view of a main part of another embodiment of the present invention. 2...Lower cap, Ro...Enclosed bottle, 5...Several parts system, 14...Shield gas, 19...Earth,
20... Molten pool, 21... Molten surface I! Department. Agent Tatsuyuki Unuma (and 1 other person) Figure 2 Salt Figure 1 Salt Figure 3 Figure 4 @ Figure 5 Figure 6 Old

Claims (1)

[Claims] While shielding the inner joint between the lower cap of the shock absorber and the attachment member to another member with shielding gas, an arc is generated between the enclosure bottle protruding outward from the lower cap and the attachment member. How to connect the lower cap of the shock absorber to other parts.