JPS58132389A - Pin-hole repairing method in manufacture process of aluminum pipe - Google Patents

Abstract

PURPOSE:To make no pin-hole exist, by detecting a pin-hole between welding and the first diameter reduction, and repairing the pin-hole by use of specified solder and flux, when covering a wire rod body of an insulated wire, etc., with an Al tape, welding a sealing part, and after that, executing multi-stage diameter reduction. CONSTITUTION:A wire rod body 1 of an insulated wire, etc., and an Al tape 3 are made to pass through a forming unit 6, and the circumference of the wire rod body is covered with the Al tape, by which a metallic pipe is formed. A sealing part of the Al tape is welded by a welding torch 7, it passes through the first diameter reducing device 8 and a trichloroethylene washing device 9 through the first drawing device 10, and the second diameter reduction 8' is executed again. In this case, after welding, if existence of a pin-hole of a weld zone has been detected, the pin-hole is hermetically sealed by use of solder consisting of 15-25% Sn, 1-5% Ag, and the balance Pb and a flux consisting of 5-20% boron zinc fluoride, 2-5% boron ammonium fluoride, and 65-93% triethanolamine or ethylene glycol.

Description

[Detailed Description of the Invention] By manufacturing Al-onium tubes using Al-based tape as a starting material, relatively thin-walled, small-diameter, and long tubes can be manufactured at low cost. It's a method.

For this reason, the inventors of the present invention have developed a method as shown above. In other words, the cause shows a production line for metal tubes with built-in filament bodies; - the filament body 1 is fed out from reel 2, and at the same time, the aluminum tube 3 is fed out from reel 4;
It is advanced through slitter 5.

Then, the two are combined, and a metal tube is formed loosely around the filament body 1 through 7 ohms (7 ohms) consisting of an edge processing roll, a plate die, and a forming die. The structure is continuously welded, passed through the first caterpillar separation device 10, and then passed through the first diameter reducing device (
Plug) 8 and Tricrane cleaning equipment 9
It passes through the second caterpillar separation device 10', enters the second diameter reducing device (Gui) 8', and the triclean cleaning device 9', and further K.
It passes through the II3 caterpillar separation device 10' and is wound onto the IIk take-up reel 11. Note that the present invention is not limited to a diameter reduction device, a caterpillar traction device, etc.

However, in manufacturing metal tubes by rolling aluminum tape into a circular shape and welding the mating ends S, it is extremely difficult to weld without pinholes at the current torch welding stage, and the following shrinkage process is required. If the pinhole is not repaired before the diameter stage (@1 diameter reduction) K is reached, this pinhole will be contaminated by the lubricating oil for the plug used in the diameter reduction S, and it will be impossible to repair the pinhole after it is sealed.

Conventionally, the presence of pinholes was considered to be unavoidable when manufacturing metal pipes by welding the mating ends of metal tapes, and the presence of pinholes was acknowledged without repair during manufacturing, which resulted in manufacturing products with poor airtightness. It was only used for.

However, if an aluminum tube containing a wire such as an electric wire whose characteristics deteriorate due to moisture absorption is to be expanded, the pinhole must be sealed with solder.

As a result of various studies, the inventors of the present invention found that general aluminum solder and 72x were unsuitable for soldering while the Ii production line was in progress without stopping the Ii production line shown in Fig. 1. I realized that this can only be achieved by doing things.

(a) Aluminum beef FI3: 15-25% by weight of tin, fs
1 to 5 weight - 1 balance lead can) 7 lux: Zinc borofluoride 5 to 2 o capacity - 1 ammonium fluoride 2 to 5 capacity -, triethanolamine or ethylene glycol 65 to 9 s volume % Aluminum pipe production line In order to perform Arun soldering without stopping, it is necessary to process the pinholes in an extremely short period of time, and if the pinholes become swollen due to soldering, the aluminum tube's Ji
Although iiK cannot be performed smoothly without deformation, satisfactory results could not be achieved with any of the solder and 7 lux sold by Kaito, other than those mentioned above.

The solder used in the present invention can be processed in a short time and does not form the shape 11 where the solder bulges.

Furthermore, the flux used in the present invention had good flow and was extremely effective in spreading the solder thinly.

In particular, with regard to flux, metal chloride-based fluxes have poor flow and are hygroscopic, while organic fluxes alone have good flow but poor retention.However, in the present invention, we have developed a flux that combines boric acid-based and organic fluxes. It exhibits appropriate flowability and retention, and even fluorine compounds, which are considered to be highly corrosive, are removed from the surface of the aluminum pipe by a trichlene cleaning device, so they do not cause any actual damage. .

As mentioned above, in the present invention, AltW is made from aluminum tape.
There is an effect that pinholes can be detected between welding and ll11 diameter reduction, and pinholes can be soldered without stopping the tandem line for manufacturing.

[Brief explanation of the drawing]

The figure shows the process for manufacturing aluminum pipes from aluminum napkin.
&A is Ruru. 3 Aluminum tape 67 Ohming unit 7 Tote 10111 caterpillar traction device, 8 First diameter reducing device 9 Triclean cleaning device, 10' Second caterpillar? +7IvSiIIL11 Patent Applicant Fujikura Electric Cable Co., Ltd.

Claims (1)

[Claims] When manufacturing aluminum pipes by forming an aluminum ellum tape into a circular tube shape and reducing the diameter in multiple stages by applying seven self-joining ends, the gap between welding and all diameter reduction is A method for repairing pinholes during the process of making aluminum pipes, characterized by detecting pinholes and repairing the pinholes by the following means -) and 伽) (a) Tin 15 to 25 weight - 1 silver 1-5
Aluminum solder consisting of weight S and balance lead, 5 to 20 volumes of zinc borofluoride, and ammonium borofluoride 2
~! Flux consisting of S capacity, triethanol, urea, or ethylene glycol 65-93 capacity