JPH01218782A - Butt welding method for mutual strip steel in continuous processing line of strip steel - Google Patents

Abstract

PURPOSE:To prevent the temp. fall of a strip steel and to prevent the uneven quality of a weld zone by controlling the strip steel clamp mechanism of the welding equipment executing the butt welding of preceding and succeeding strip steels and the steel strip opposing side part of a backing mechanism by heating them at the same temp. as that of the strip steel, thermal-shielding the strip steel non-opposing side part and controlling at room temp. CONSTITUTION:A warm water is fed by its circulation into strip steel opposing side part 13a, 14a, 16a by providing warn water circulation feeding path 13b, 14b, 16b on the strip steel clamp mechanism 13, 14 at inlet and outlet sides and the strip steel opposing side part 13a, 14a, 16a of a backing mechanism 16 and the strip steel opposing side part 13a, 14a, 16a are controlled at the same temp. as those of a preceding strip steel Sa and succeeding strip steel Sb. The strip steel non-opposing part 13c, 14c, 16c are controlled at room temp. by preventing the temp. rise due to the radiation heat form strip steel Sa, Sb by interposing heat insulating plate 13d, 14d, 16d in the space with the strip steel opposing side part 13a, 14a, 16a on the clamp mechanism 13, 14 at the inlet and outlet sides and the strip steel non-opposing side part 13c, 14c, 16c of the backing mechanism 16.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for butt welding steel to each other in a continuous processing line for steel strips.

"Prior Art" Generally, in a continuous processing line for steel strips, such as a continuous pickling line for steel strips or a continuous cold rolling line for steel strips, the inlet side of the steel strip looper in the upstream of the line is , butt the rear end of the leading steel strip and the front end of the trailing steel strip/
8 are in contact.

Conventionally, in order to butt weld the rear end of the leading steel strip and the front end of the trailing steel strip, a laser device l as shown in FIGS. 60-1184
(See Publication No. 17).

The laser welding device 1 includes laser welding devices 1 and 2,
After advancing to between the upper and lower entry side steel strip clamping mechanisms 3, the upper and lower exit side steel strip clamping mechanisms 4, and both steel strip clamping mechanisms 3.4, and being clamped by the entry side steel strip clamping mechanisms 3. Row steel strip sbO front end and exit side steel strip clamp mechanism 4
A high-precision shearer tJM5 shears the rear end of the preceding steel strip SaO which is clamped by the shearer 5, and advances from the symmetrical side of this shear 5 to between both steel strip clamping mechanisms 3.4 to shear the rear end of the preceding steel strip Sa. A device comprising a backing mechanism 6 that abuts over the lower surface of the butt between the end sheared end surface and the leading sheared end surface of the trailing steel strip sbO [Problem to be Solved by the Invention-1] There is a temperature range for the steel strip that is suitable for each treatment, and maintaining this temperature is important for stable operations and stable quality as a result of the treatment.

However, the temperature of the welding equipment is lower than the temperature of the steel strip, and the side of the welding equipment that is in contact with the steel strip has a larger heat capacity than the steel strip. In the processing line, when the rear end of the leading steel strip and the front end of the trailing steel strip are butt welded by the laser welding device, the trailing end of the leading steel strip and the front end of the trailing steel strip are Since each steel strip is clamped by the clamping mechanism and brought into contact with the backing mechanism, the temperature of the clamped portions of both steel strips having a small volume drops rapidly.

If a copper strip that has exceeded the processing temperature of the steel strip is passed through the processing line as it is, the processing quality will naturally deteriorate, and in extreme cases, the steel strip may deteriorate due to uneven deformation resistance during rolling. In some cases, the welds may break at the mutual butt welds, resulting in a shutdown of operations.

One possible countermeasure is to raise the temperature of the side of the welding device that contacts the steel strip to the steel strip temperature, but changes in the temperature of the steel strip clamping mechanism, backing mechanism, etc.
It has become difficult to maintain a constant mechanical accuracy of the steel strip clamping mechanism, backing mechanism, etc., which has become a major problem, especially in laser welding equipment where the butt precision of both steel strips is strict.

The present invention has developed a method for butt welding steel strips together in a continuous processing line for steel strips in order to solve these conventional problems.

"Means for Solving the Problems" The gist of the present invention is to provide a steel strip clamping mechanism and a backing in a welding device that butt-welds the rear end of a preceding steel strip to be continuously processed and the front end of a trailing steel strip. A steel strip clamping mechanism and a backing mechanism that control the heating of the steel strip contacting side of this mechanism to approximately the same temperature as the temperature of each of the steel strips, and supporting and operating the steel strip contacting side. In addition to thermally insulating the non-contacting side of the band from the steel band contacting side, The present invention relates to a method for butt welding steel strips together in a continuous steel strip processing line in which cooling is controlled according to JA.

"Operation" As described above, the steel strip clamping mechanism and the backing mechanism's opposing sides of the steel strip are brought to almost the same temperature as the preceding and following steel strips to be continuously processed, so that the two steel strips are brought into contact with each other. During welding, the temperature drop in both steel strips caused by clamping them can be stopped, and the sides of the steel strip clamping mechanism and the backing mechanism that are not in contact with the steel strips are kept at room temperature, so welding is possible. The mechanical accuracy of the device can be maintained constant.

"Example" Next, an example of a method of butt welding steel strips together in a continuous processing line for copper strips according to the present invention will be described below with reference to FIG.

FIG. 1 shows a laser welding torch 12, upper and lower entry side steel strip clamping mechanisms 13, upper and lower exit side steel strip clamping mechanisms 14, and a backing mechanism 16 in a laser welding device 11.

Steel in the clamp mechanism 13);) Steel in the clamp mechanism 13! f4
Text++ A hot water circulation supply path 13b is provided in the armor side portion 13a, and a hot water supply device (not shown) is connected to the steel strip contacting side portion 13a.
Hot water is circulated and supplied inside the steel strip, and the temperature of the steel strip contacting side portion 13a is controlled to be approximately the same as the temperature of the preceding steel strip Sa and the following steel strip sb.

In addition, a heat insulating plate 13d is provided between the steel strip non-contact side portion 13c of the entry side steel strip clamp mechanism 13 and the steel strip contact side portion 13a.
Cooling water circulation supply path 13, which is interposed with a cooling water and maintains normal temperature.
e is provided to circulately supply cooling water from a cooling water supply device (not shown) into the steel strip non-contacting side portion 13c, and the steel strip non-contacting side portion 13c is connected to the leading steel strip Sa and the trailing steel strip Sa. The temperature is controlled at room temperature without being raised by the radiant heat from the sb.

Steel strip contacting side portion 1 in the exit side steel strip clamping mechanism 14
4a, a hot water circulation supply path 14b is provided to circulate and supply hot water from a hot water supply device (not shown) into the steel strip contact side portion 14a, and the steel strip contact side portion 14a is connected to the preceding steel strip Sa and the rear steel strip Sa. The temperature is controlled to be approximately the same as the temperature of the steel strip sb.

In addition, a heat insulating plate 14 is placed between the steel strip non-contact side portion 14c that is LJ on the exit side steel strip clamp mechanism 14 and the steel strip contact side portion 14a.
A cooling water circulation supply path 14 that passes through W through d and maintains normal temperature.
e is provided, and cooling water is circulated and supplied from a cooling water supply device (not shown) into the non-contacting side portion 14c of the steel strip, and the non-contacting side portion 14c of the steel strip is The temperature is controlled to room temperature without any temperature rise due to the radiant heat from the band sb.

A hot water circulation supply path 16b is provided in the side portion 16a facing the steel strip in the backing mechanism 16, and hot water is supplied 1h5 times from a hot water supply device (not shown) into the side portion 16a facing the steel strip. Belt contact side! 6a, advance steel 1i! ' The temperature is controlled to be approximately the same as the temperature of S a and the trailing steel strip sb.

In addition, a heat insulating plate 16d is interposed between the side portion 16c of the backing mechanism 16 not in contact with the copper strip and the side portion 16a in contact with the steel strip, and a cooling water circulation supply path 16e for maintaining room temperature is provided.
Then, cooling water is circulated and supplied from a cooling water supply device (not shown) into the copper strip non-contacting side portion +6c, and the steel strip non-contacting side portion 16c is supplied with cooling water.
is controlled to room temperature without increasing the temperature due to radiant heat from the leading steel strip Sa and the trailing steel top fsb.

"Effects of the Invention" As described above, according to the method of the present invention, a steel strip clamping mechanism and a backing in a welding device that butt-welds the rear end of the preceding steel strip to be continuously processed and the front end of the following steel strip. Since the side of the mechanism that faces the steel strips is brought to almost the same temperature as each of the steel strips, the two steel strips are brought into contact with each other. When welding, it is possible to prevent the temperature drop of both &l'tLt due to clamping both steel strips, and also to maintain the sides of the steel strip clamping mechanism and the backing mechanism that do not contact the steel strip at room temperature, so welding is possible. The mechanical accuracy of the device can be maintained constant.

As a remarkable example of the implementation effect of this, in the continuous cold rolling of steel strip, when the steel strip to be rolled is a difficult-to-roll steel strip such as a high deformation-resistance steel strip, this difficult-to-roll steel strip is
There is so-called warm rolling (see Japanese Utility Model Application Publication No. 17202/1983), which involves preheating to about 10°F (°C) before rolling, but it is possible to prevent breakage of the butt-welded parts of the steel strips and to prevent quality unevenness due to temperature differences. .

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the method of the present invention, FIG. 2 is a schematic front view of a conventional laser welding device, and FIG. FIG. 4 is a perspective view of FIG. 3, and FIG. 5 is an explanatory diagram showing butt-l welding of steel strips using a conventional laser welding device.

Claims (1)

[Claims] (1) In a welding device that butt-welds the rear end of the preceding steel strip to be continuously processed and the front end of the trailing steel strip, the steel strip contacting side portions of the steel strip clamping mechanism and the backing mechanism are connected to each of the steel strips. The non-contacting side of the steel strip of the steel strip clamping mechanism and the backing mechanism which are heated to approximately the same temperature as the temperature of the steel strip and which support and operate the steel strip contacting side are connected to the steel strip contacting side. A method for butt welding steel strips together in a continuous processing line for steel strips, which is characterized by heat isolation and cooling control to room temperature.