JPS58167093A - Formation of weld bead - Google Patents

Abstract

PURPOSE:To improve mechanical properties with the fined metallic texture of a weld bead and to assure the build-up thickness of the weld bead easily by compressing the fluid weld bead formed successively according to propression of welding with a pressurizing roll thereby smoothing the bead. CONSTITUTION:A welding rod A and a pressurizing device 1 so as to be located behind the welding rod in the advance direction are first disposed in the welding position. While the rod A is melted by an arc or gas, the rod is moved leftward and the build-up welding of a butt part 3 is executed. The weld bead B formed successively during this time is compressed in the state of the molten bead C prior to solidifying with a pressurizing roll 5 which is operated so as to follow up the rod A. The metallic texture of the compressed bead C is fined in a compression stage and the surface of the bead is formed smooth. The bead is solified by a heat radiating effect. As a result, the metallic texture of the bead B is made fine and uniform, and the mechanical properties thereof are improved. Since the surface of the bead B is smoothed, the thickness of building- up is made constant, and the assurance of the constant thickness is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method for forming weld beads that are sequentially formed as welding progresses.

Generally, the solidification state of the weld bead that is formed sequentially as welding progresses is determined by the arc phenomenon during welding and the melting phenomenon caused by heating, but these arc phenomena and melting phenomena depend on the welding work conditions. The solidification engraving of the l1II contact bead changes from time to time due to changes such as 7 and 7.

By the way, if the solidification shape movement of the weld bead changes T, there is a possibility that, for example, the following wR point may occur.

First, the metal structure of the mI & knee% weld twill bead tends to become non-uniform, and the mechanical properties of the port tIl section tend to become unstable.

Because differences in height tend to occur at the weld bead, and the 11 surfaces of the welded part tend to become uneven, it is difficult to guarantee a single build-up thickness during build-up welding. In the case of a multi-layer **, variations in the 111JII conditions of the upper layer weld bead occur, resulting in a deterioration in the quality of the welded area. The present invention was made in consideration of the above-mentioned circumstances, and the progress of the welding is reduced. The fluid weld bead that is sequentially formed as a result of [smoothing] the weld bead by compressing it with a pressurizer makes the metal structure of the weld bead finer and improves its mechanical properties. , Guaranteed weld bead build-up thickness [
To provide a method for forming a weld bead that can be easily tightened.

The following is an example of the present invention applied to build-up welding.
Explanation will be given based on Figures 11 and 11.

In this example, weld bead [Special II# for pressure JIT]
A suitable pressurizing device is used.

This pressurizing device 1 is moved above the butting island S of the base materials 11 and 1, and is rotated according to the support frame number and the support frame number F. Pressure roller b is freely supported, guide rollers 6, 6 are rotatably provided on both of the support frame numbers, and one of the support frame numbers is attached to the top of the support frame 4. It is in P'N contact with a freely mounted pressing rod 7.7. and the support frame and the pressing rod 7. ? There is a spring 8.8 between
is attached, and the elasticity of the spring 8.8 always presses the support frame 4 (pressing rod 7) in the r direction. ! In addition, when the guide plates 6.6 and 6 are placed on the base materials z, l, the guide plates 6.6 and 6, when placed on the base metals z and l, the pressurizing plate S and the upper surface of the base metals S and s. The thickness of the molten bead C determined by the interval t-11112, which will be described later.
The pressurizing device 1 is placed behind the person and the welding material fI+A in the direction of movement.

Next, while melting the molten III material At- by an appropriate means such as arc or gas, move it downward with the arrow Jv: J, and perform build-up welding 1v4 of the butt joint 3.
Ru. At this time, the shape of the molten bead C before solidification is compressed by the pressure roller b followed by the material worker, as shown by the chain line T in the figures B111/ and M1. In this way, the compressed molten bead C undergoes finer metal structure and sag during the compression process! ! The surface is shaped into a &:rlL shape to make it smooth, and it becomes solidified due to heat radiation. As a result, the metal structure of weld bead B becomes uniform as the metal structure becomes finer, and its mechanical properties are improved. Ru. ! T-1111! Since the surface of the I bead B is smooth, the build-up thickness becomes constant and it is easy to guarantee it. On the other hand, the IIJ and IB figures are examples applied to this Yamei P multilayer welding. It's a great show.

In this embodiment, the pressure roller B matched with the bevel and shape of the base material 2 can be inserted into the pressure roller S when the pressure roller 6 is butted against the surface of the pressure roller B in use.

In this example as well, the molten material A was
7 layers of weld beads Bt while melting @a
As the molten bead C is continuously formed, the molten bead C before solidification is inserted into the pressurized four-ra 6&:
compress.

The molten bead C compressed in this way is shaped so that the metal structure becomes fine and the surface becomes smooth during the compression process, and becomes solidified by the heat dissipation action. Lower layer weld bead B formed by
On top, the next layer of weld bead BIm is formed by molding in the same manner as described above.

In the process of such multi-layer welding, the W1 contact bead B of each layer is formed into a shape that matches the outer circumferential shape of the pressure roller 1, and can be applied to the metallographic tube welding process for the purpose.

Also, as the member organization becomes smaller, the organization becomes more uniform and melts! Improving the mechanical properties of alcoholic beverages '2r
Since the top surface is smooth, it is easy to set the welding conditions when using the upper layer weld bead B [FF1T], which improves the quality of the welding process and improves the efficiency of welding work. I can do it.

In addition, in the above description, an example was shown in which the present invention is applied to overlay** and multilayer**, but the present invention is not limited to these and can be applied to various other welding processes.

As explained above, according to the present invention, the fluid weld bead that is sequentially formed during welding is compressed and smoothed by the pressure roller, so that the structure of the weld bead [refined and melted] is smoothed. ! Mechanical properties of 1a can be improved. ! In addition, when overlaying welding, it is easy to guarantee the overlay thickness,
For multi-layered pipes, it is easy to set the welding conditions for each layer.
? III! It can be measured to improve the quality of the island and [% improvement in work efficiency].

[Brief explanation of the drawing]

In the drawings, 1IIWJ and Figure 1 are explanatory diagrams of an embodiment in which the present invention is applied to build-up welding, and IIIWJ is a front view of the island in cross section, and the track view is along the 1-1 line in Figure 1. The arrow sectional tb diagram, Figure 11.7, and the reference figures show the present invention [Multilayer WI
Example applied to contact [JI! Figure 3 is a cross-sectional normal TI diagram of the product, and Figure 3 is a sectional view taken along the y-ywi &: arrow of Figure 3. 1...pressure device, g...base material, g...
・・Tsutsuaisasejima, 4・・・Support frame, b・・・・
・・Pressure p-ra, 6...Guide 4-ra, fu...
...Press rod, 8...Spring,
...Bevel, A...Welding material, B...
・WI contact bead, C. Old... molten bead. Applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Seal Figure 2 Figure 3 Figure 3

Claims (1)

[Claims] A fluid weld bead that is formed sequentially as welding progresses. [The weld bead is compressed by a pressurizer during the solidification process, and the weld bead is smoothed. [Characteristics] Molding method/