JPS602700A - Electrode cloth for electrolytic descaling - Google Patents

Abstract

PURPOSE:To improve the durability of electrode cloth for descaling by winding the tip of the cathode stitcher of a descaling apparatus with cloth of inorg. fiber, impregnating an electrolytic soln. into the cloth, and supplying electric current to carry out descaling. CONSTITUTION:The tip of the cathode stitcher of an electrolytic descaling apparatus is wound with cloth of inorg. fiber such as quartz or glass fiber. An electrolytic soln. is impregnated into the cloth, the cloth is brought into contact with a part stained with welding scale, and electric current is supplied to dissolve and remove the scale. At this time, the inorg. fiber is hardly corroded by the acid or alkali soln., and it has high strength at high temp., so the life can be considerably prolonged.

Description

[Detailed Description of the Invention] A secondary terminal (anode) of a DC power source is connected to the welding base material, and a synthetic fiber cloth (mainly felt) is wrapped around the stitcher tip of the other secondary terminal (cathode).

Electrolytic descaling is widely used in the welding industry today, in which an electrolytic solution is added to the welding scale, which is then brought into contact with the welding scale to dissolve and remove it. However, the synthetic fiber cloth used in the apparatus is easily damaged and must be frequently replaced.

The present invention has been made in view of the above circumstances.

That is, electrolyte solution (aqueous solution containing neutral salt or acidic aqueous solution)
The temperature rises when electricity is applied, producing strong acid at the contact area of the cloth, which causes the cloth to melt or age, making it unusable.

The present invention consists in using a cloth made of inorganic fibers such as Kaol 9 quartz and glass as an alternative to this synthetic fiber cloth. It is a well-known fact that the above-mentioned inorganic fibers are hardly eroded by acid or alkaline solutions and have high high-temperature strength.

Next, examples will be described.

Example Stainless steel (SUS-304) welded parts (thickness:
The following table shows the deposit (time) of cloth (thickness - 2 mm) when descaling (mm). The electrolytic conditions were as follows.

Electrolysis conditions Current density: 600 to 800 A/d, Voltage: 20 V or more, 10% Na2 SO4 (aqueous solution of neutral salt)
In the electrolyte, it takes 12 minutes for polymer synthetic fibers and acrylic.

Polyester has a short lifespan of 18 minutes, Kepler has a short life of 21 minutes, while inorganic fiber and Kaol have a short life of 96 minutes.

It was found that the lifespan of quartz was 127 minutes and that of glass was 104 minutes, a dramatic improvement in the lifespan.

In addition, with an electrolyte of 10% H2S04 (strong acid), it takes 1 minute for polymer synthetic fibers and acrylic, and 2 minutes for polyester.

The lifespan of plastic is extremely short at 2 minutes, while the lifespan of inorganic fibers and Kaol is 46 minutes, 62 minutes for quartz, and 58 minutes for glass.
minutes and its durability was found to be excellent.

As described above, the present invention uses inorganic fibers such as Kaol 1 quartz or glass instead of conventionally used polymeric synthetic fibers, thereby increasing the durability of the fibers from about 8 to 62.
It was found that the improvement was □ times.

Patent applicant 1) Chobei Kuchi (8rn ,LJz □　4

Claims (1)

[Claims] In order to remove scale generated during welding, an electrolytic type descaling device is characterized in that an inorganic fiber cloth such as quartz or glass is wrapped around the tip of the cathode stitcher of the electrolytic descaling device, and an electrolytic solution is soaked in the inorganic fiber cloth and descaling is performed by energizing the cloth. Electrode cloth for descaling.