JPH0191982A - Electroslag welding method - Google Patents

Abstract

PURPOSE:To prevent the occurrence of crack starting points in a base metal, to improve quality and to reduce working cost by placing members opposite to the base metal at prescribed intervals and covering the surfaces of the weld starting parts of the base metal with members proof against high temp. CONSTITUTION:Members 2 are placed opposite to a base metal 1 at prescribed intervals and the surfaces of the weld starting parts 3 of the base metal 1 are covered with members 10 proof against high temp. Electroslag welding is then carried out. By this method, weld crack can be prevented, stable quality can be ensured, yield is increased and the control of daily program is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of application on d-beams] The present invention relates to an electroslag welding method, and particularly to a welding method for preventing defects occurring at the welding start portion.

[Conventional O technology]

Figure 3 is a cross-sectional view showing the situation when ribs are welded to the shaft using the conventional electroslag welding method 6).
In the figure, (1) is a base material, such as a shirt, and i2+ is a member that faces the base material (1) at a predetermined interval, and if it is flesh, it is a lip (3
1 is a tab plate that prevents the molten metal (5) from freezing down and improves the arc start, (4) is the molten metal (6) and slag (6), and the t-dam welding metal (7) The water-cooled steel plate (8) serves as a guide for feeding the wire (9), and it also melts and forms a slag (
6) and a consumable nozzle that turns into molten metal (7).

Next, the operation will be explained. The wire (9) fed through the consumable nozzle (8) first connects the tab plate (3) and O1.
&l1lK arc t- occurs, making slag (6) and molten metal 151k. Slag i61 O1!1! When it is deep enough to search, the current supplied through the wire (9) and the slug tel (D tI & air resistance 9 sludder (6)
The wire (9) fed through the middle pipe of the consumable nozzle (8) melts and forms the molten metal (5), and at the same time the consumable nozzle itself melts. #(8) is also melted, and the molten metal (5) and slag (6) are welded to the base metal (1) and the component ( 2) Join.

[Problem that the invention seeks to solve]

The conventional electro-slag welding method is as described above.
Since the welding start part is not completely electroslag welded, the incomplete welding part is generally removed by machining, etc., but the base metal with a large heat capacity gradually penetrates into a wider area. The penetration width into the base metal is narrow and the penetration depth is shallow, and it is easily K11l due to the O thermal stress after welding, and this becomes the starting point and penetrates into the base metal O penetration line. There was a problem in that cracks occurred along the lines.

These cracks are harmful and must be completely removed, but in order to completely remove them, K must be subjected to stress relief annealing6)
However, there were problems in terms of cost and schedule.

This invention was made to solve the above problems, and welding star)! An object of the present invention is to provide an electroslag welding method that can prevent cracking of the IKR1 base material.

[Problem [O means to solve]]

In the electroslag welding method according to the present invention, the surface of the base material at the welding start part is covered with a high temperature resistant member 40.

[For production]

The welding method in the ζO invention covers the surface of the base material and prevents welding into the base metal at a certain time at the start of electroslag welding.

[Practical implementation of the invention]

Hereinafter, the present invention will be explained with reference to the figures. 1st
In FIG. 2, ν is a high-temperature resistant member of the caul plate that covers the surface of the base material 11) at the starting point of four-wire welding, such as ceramic vine.

In addition, other O, W, and W are explained by O as in the past [omitted].

Next, the operation will be explained. The base material fi of the welding start part to be welded conventionally and by colleagues
7), electroslag welding starts O unstable state MID#, the high temperature resistant member (G) is the base material 111
Stop O seeping into tvJ. Next, welding progresses and the Air I resistance
Electroslag welding is in a wide state when it crosses the A-grade member (G), so penetration into the base material (1) begins rapidly, and penetrates widely and deeply, making it effective against thermal stress. Base material (1) No starting points for K cracks occur.

Once the welding is complete, the high temperature resistant member (g) is removed by machining or the like at the same time as the small amount of incomplete welding.

However, in the above embodiment, Cera 1 was used as the high temperature resistant member (g).
．． Although a hollow copper plate is shown, any material that does not melt at high temperatures may be used.

Further, although the base material (1) of the shaft is shown as 9It, it may be a flat plate and the same effect as in the above embodiment can be obtained.

〔Effect of the invention〕

According to the above invention, the surface of the base material at the start part of electroslag welding is covered with a patch plate made of a high-temperature resistant material, so there is no starting point for the base material to crack, and quality can be improved. This has the effect of reducing costs and securing schedules at the same time.

[Brief explanation of the drawing]

Figure 1 is a front view showing an electro-slag welding method according to an embodiment of the present invention, Figure 2 is a perspective view of Figure 1, and Figure 3 is a conventional electro-slag welding method.
FIG. (1) is a base material, (2) is a member, and (2) is a high temperature resistant member. Note that throughout, the same reference numerals indicate the same -t or corresponding parts.

Claims (1)

[Claims] A welding method for electroslag welding a base metal and a member facing the base metal at a predetermined interval within the predetermined interval, characterized in that the surface of the welding start part of the base metal is covered with a high humidity resistant member. electroslag welding method.