JPS58141852A - Cooling method of welded material - Google Patents

Abstract

PURPOSE:To prevent occurrence of welding defect and improve quality by cooling compressed gas and jetting to a welded material from opposite side of a welding torch. CONSTITUTION:A welding torch 9, a nozzle 16 and a vortex tube 17 rotatearound a curved tube 8 together with a welding head 7, and the nozzle 16 is positioned always opposite to the torch 9 across the curved tube 8. Compressed air supplied from an air compressor enters the vortex tube 17 and warm air is discharged to outside from a flow rate regulating valve and cooled air enters the nozzle 16. Cooled air is jetted to the curved tube 8 from a nozzle. In this case, cooled air is jetted to the curved tube 8 from opposite side of the welding torch 9. Consequently, the curved tube 8 is cooled without obstructing welding.

Description

[Detailed description of the invention] This invention relates to a method for cooling a welded material during S*.

KfIIl joins pipes together! will be carried out.

In this case, straight pipes are connected to each other as shown in Figure 1. The straight pipes 1 are butted against each other and the straight pipes 1 are rotated around the axis of the straight pipes 1. Then, install the welding torch 2 downward from the top and weld the groove 30 portion of the straight pipe 10. Since tube 1 rotates with #l chain like jin, cooling is a must! In the case of a material for cleaning, insert nozzle 4 from below toward the straight pipe IK into alIO25.
If water is sprayed, the straight pipe 1 itself will rotate, and the gold circumference of the straight pipe 10 will become a leg for cooling.

On the other hand, if the tube is rotated by 1k and the stone to be exposed to is 1k, then the tube is rotated by 1lj.
1 turn the cam tube O1 JIKJIII) will be carried out.

A front view and a side view of the conventional Oyu111111111M Kasumihao device are shown in *xai and asaku, respectively. The head 7 is rotatable and the tube is 8eCI! I will be jlled. #l From the torch 9 to the first pipe, the atta is flown, and from the wire handle 1o to the wire feeding motor 110 (by the driving force) wire cable 1
4' and the l1aI wire 14 through the puller guide chig 13. In this way, one bus folding is completed when the welding head 7 equipped with the torch 9) turns one pipe 5ottt)j by a drive (not shown) while the welding head 7 turns one pipe 5ottt)j. This is the wire table 14'.

Power cable that supplies electricity 12. The gas cable 15 that supplies inert gas winds around the bent pipe 8 as shown in FIGS. 4 and 5. Therefore 1 pass Il! l! I
Each time, with the arc stopped, the f# welding head 7 is rotated in the opposite direction to the f# welding time, and the wire cable 14',
Power cable 12 and gas cable 15 are released.

As described above, all passes of #l contact are completed by repeating the forward and reverse rotations of the curved pipe 8 of the #l contact head 7.

However, in this welding method in which the S* head rotates to weld the grooves of the fIIIWl material, the bent pipe is not cooled; S * Since the head's own position rotates, water splashes on the welding head, and in the case of the above-mentioned all-welding welding, ** 1 every time the pass is repeated.
IIIO heat is accumulated in the target material and the temperature of the part increases.

Therefore, cracks due to this temperature rise, deterioration of corrosion resistance due to carbide precipitation, and welding defects such as oxidation occur, leading to a decrease in quality.

The object of the present invention is therefore to provide a method for cooling materials to be welded, which eliminates these drawbacks and enables high-quality f#. The configuration of the present invention that achieves this purpose is to rotate the welding torch around the Sm material to perform ** #l! ! The method is characterized in that the compressed gas is first cooled, and then the material to be S is cooled by always injecting the compressed gas from the direction substantially opposite to the torch O toward the material. do.

Below, I will tell you the truth! This will be explained in detail based on one embodiment shown in 1liIi.

Expansion of the cooling method for Sm material according to this qa@, since it is used when welding is performed by rotating the torch with the S* material at the center, this example uses the conventional 01Fm! The apparatus shown in FIG. 1 is equipped with a device for carrying out the cooling method according to the present invention. The same parts as those in the conventional **** installation are given the same numbers, and only the differences will be explained.

sg, 711th. As shown in FIG. 8, the fII! A nozzle 16 is provided approximately on the opposite side of the II torch 9. Scissors nozzle 16ti connecting pipe 2
2 to the portex tube 17, and is further connected from the supply port 21 of the axillary portex tube 17ti to a near compressor (not shown) by a nozzle 24. These nozzles 16 and portex tubes 17 are attached to the head 7. Therefore, the bath torch9. Nozzle 16, portex tube 17 is 11
! ! - Rotates around the curved pipe 8 together with the head 7, and is always located on the substantially opposite side of the IIJI torch 9 with respect to the nozzle 16 and the curved pipe 8.

As is well known, the portex tube 17 has a structure as shown in FIG. In the picture, a cylindrical book $18
An orifice 19 is provided at the top, and an IIKH flow rate ratio control valve 20 is provided at the bottom.

From the supply port 21 connected to the near compressor to the main body 18
When compressed air is blown in the tangential direction of the inner circumference, 1 main body 18
An ultra-high-speed rotating vortex (200,000 to 300,000 revolutions per minute) is created inside, as shown by the arrow.

A large pressure difference is created between the center and the outer periphery of this vortex, causing air to move around the center and expand, resulting in a drop in temperature. The cold air generated in this center is the orifice 19
The air at the outer periphery is discharged from the donut-shaped gap of the flow ratio adjustment valve 20 to the outside.

The nozzle 16 is shown in FIG. The nozzle 16 is a bent pipe 8
The casing has a concave rounded surface facing the portex tube 17, and is connected to the portex tube 17 through a connecting pipe 22. A large number of jet ports 23 are provided on the surface facing the curved pipe 8.

Cooling air is ejected from the vent 23.

Although compressed air is used as the compressed gas in this embodiment, it is not limited to air.

Portex tubes are used to cool the air, but various other cooling methods are possible.

Further, in this embodiment, the nozzle is attached to the welding head and rotates together with the welding head, but the nozzle may be rotated by a separate driving means.

S* is performed as follows using this method of cooling the material to be welded. The compressed air supplied from the air compressor enters the portex tube 17 from the supply port 21.
Warm air is discharged to the outside through the flow rate ratio adjustment (5?20), and only cooling air enters the nozzle 16 through the connecting pipe 22.

Then, this cooling air is ejected from the ejection port 23 toward the bent pipe 8. In this case, the welding torch 9 is connected to the bent pipe 8.
Since cooling air is always blown out from the substantially opposite side, the bent pipe 8 can be cooled without interfering with welding.

As described above with reference to the drawings, the present invention has the following effects. Since cooling gas is blown onto the Sm part, the temperature can be increased, preventing welding defects and improving quality.

It is possible to weld materials that were previously impossible to weld due to the inability to cool the surface. Not only during Sm but also during non-welding
It has a great cooling effect because cooling gas can be sprayed onto the material. Since cooling is performed using gas, unlike cooling using a casing, it is extremely easy to use and handle, and there is no need for a disposal W1 after use. # Nozzle that spouts gas! The drive motor for rotating the welding head attached to the welding head can also be used to rotate the nozzle.

[Brief explanation of drawings]

11Ill is an explanatory diagram showing a cooling method in the case of straight pipe welding, and FIGS. 211 to 5 relate to a welding device for one pipe]. Figure 2 is a front view, Figure 3 is a side view, and Figure 4rI! Fig. 5 is a front view for explaining the Ja action, Fig. 5 is a side view for explaining the action, and Figs. , 5th ai1
is a front view, Fig. 7 is a side view, No. 8111 is a plan view, No. 9 is a front view.
The figure is an explanatory diagram of the portex tube, and FIG. 10 is an explanatory diagram of the nozzle. In the drawing. 6 is the herad clamp handle. 7 is f # Australia head, 8 is Du bend pipe. 9 is 1lIII torch. 10 is a wire reel. 11 is a wire feeder, 12 is a power cable, and 13 is a wire guide tip. 14 bride welding wire. 14' is a wire cable. 15 is a gas cable. 16 is a nozzle. 17 is portex tube. 18th edition body. 19 Oriais. 20 is a flow ratio control valve. 21 is the supply port. 22 Ti connection pipe, 23 Tsumugi spout. 24 is a pipe. Patent Applicant: Mitsubishi Heavy Industries, Ltd. Sub-Representative Patent Attorney: Shibu Party Seki (1 person)

Claims (1)

[Claims] #lI mainly for Sm materials! ) - The connection is made by rotating the joint. After the compressed gas has been cooled, the
ll1 material is always subjected to almost the opposite effect of the above-mentioned twin torches *
*A method of cooling materials to be welded, which involves cooling the materials by spraying the jet toward the materials.