JPS60203397A - Filler metal for penetration tig welding - Google Patents

Abstract

PURPOSE:To reduce the consumption of an inert gas by filling specifically a flux contg. a specific weight % of fluoride of metal to the inside of a sheath and incorprating a specific amt. of slag forming material into the flux. CONSTITUTION:A flux 2 contg. <=30wt% fluoride of metal is packed to the inside of a sheath 1 at a rate of 1/8-3/2 the weight of the sheath 1. A slag forming agent is further incorporated into the flux 2 at 2-6% of the entire weight of the product. The groove base 5 of staineless steel plates 3a, 3b is heated by a tungsten electrode 6 while a filler metal 4 is supplied toward the base 5. The flux 2 melts to flow and the melts fills the space between the plates 3a and 3b from which the melt spreads to the rear side. Since the fluoride of metal and slag forming agent are contained in the flux 2, the consumption of the inert gas is considerably reduced by the penetration welding thereof.

Description

[Detailed description of the invention] The present invention relates to improvements in Uranami TIG welding filler metals.

As is well known, when welding an alloy steel plate on one side using TIG (tungsten electrode inert gas) welding, a grooved jig is placed on the back side of the groove of the welding material to allow inert gas to flow through the groove. This was done by using bare wire filler material on the front side of the tip to form a high quality bead on the back side of the bottom of the groove.

However, such Uranami welding has disadvantages in that it is troublesome to attach and detach the grooved jig, and the amount of inert gas flowing through the grooved jig increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a Uranami TIG welding filler material that allows easy attachment and detachment of a grooved jig and reduces inert gas consumption compared to conventional ones. It is.

An embodiment of the present invention will be described below with reference to FIG.

1 in the figure is a cylindrical metal outer skin having a thickness of 0.1 m and a diameter of 4 m, for example. The material of this outer skin 1 is, for example, uncast steel 5US308L. Inside this outer skin 1,
It is filled with 7 luxes 2 whose weight is approximately 115 times the weight of the shell 1. However, the weight of this flux 2 is
It is preferable to set it as 1/8 - 3/2 of the weight of. Here, if the weight ratio is smaller than 1/8, it is difficult to uniformly fill the inside of the outer skin 1 with the flux 2.

On the other hand, if it exceeds 3/2, welding workability is likely to be impaired. Also, some flux 2 contains 30°, at least 30% by weight.
% or less of metal fluoride. Here, the weight ratio is 30
%, it causes fluoride pollution. Furthermore, as a flux component, slag forming material is added in an amount of 2 to
Contain 6%. Here, if the slag forming material is less than 2%, the flux 2 cannot be uniformly filled into the outer skin 1. On the other hand, if it exceeds 6%, welding workability is likely to be impaired. Note that the components of the slag forming material are as shown in the following table, for example.

Next, a case where Uranami welding is performed by TIG welding using the filler metal having the above-described structure will be described with reference to FIG. 2. First, in advance, steel plates 3a and 3 made of uncast steel 5Us304 are prepared.
Set b. Subsequently, while supplying the filler metal 4 according to the present invention to the groove bottom 5 of the steel plate 3a13b, the TI
The filler metal 4 and the groove bottoms 5 of the steel plates 3a and 3b are heated by the tungsten electrode 6 of G welding. As a result, the flux 2 in the filler metal 3 melts and flows from the front side of the groove bottom 5 to the gap between the steel plates 3a and 3b, and then flows to the back side. After cleaning, it adheres to the back side and forms a film. Further, the surfaces of the steel plates 3a and 3b of the groove bottom 5 and the outer skin 1 of the filler metal 3 melt and flow in the inert gas to form a weld metal (bead) of deposited steel at the groove bottom 5. In this case, the bead is formed with its upper surface covered with inert gas and its lower surface covered with molten flux, completely shielded from the atmosphere, so that it has a beautiful surface with no internal defects.

According to the filler metal of the present invention, a predetermined amount of flux 2 is filled inside the outer skin 1, and this flux 2 contains 30% or less of metal fluoride by weight, and also contains a slag forming material. Since the entire product has a structure in which the content is 2 to 6% by weight, when welding the steel plates 3a and 3,
The groove-shaped jig for inert gas can be easily attached and detached from the back side of the groove b, and the consumption of inert gas can be reduced compared to the conventional method. Furthermore, the surfaces of the welded parts of the steel plates 3a and 3b are cleaned without causing defects in the beads.

5- In addition, in the above example, uncast steel 5LI was used as the material of the outer skin.
Although S308L was used, the present invention is not limited to this. Furthermore, various cases may be considered regarding the thickness and diameter of the outer skin. Furthermore, the weight of the flux is not limited to 115% of the weight of the outer skin, but may be 1/8 to 1/8 of the weight of the outer skin as described above.
Anything within the 3/2 range is fine.

As described in detail above, according to the present invention, the grooved jig can be easily attached and detached, and the consumption of inert gas can be reduced compared to the conventional method. It can provide filler metal.

[Brief explanation of the drawing]

Fig. 1 shows a filler metal for Uranami TIGIW welding according to an embodiment of the present invention, and Fig. 2 shows a TIG using the filler metal shown in Fig. 1.
It is an explanatory view showing the state where Uranami welding is performed by welding. 1... Outer skin, 2... Flux, 3a13b...
Steel plate, 4... Filler metal, 5... Groove bottom, 6... Tungsten electrode. 6- 1 figure, 2 figures, 1 song ＼ 2 en Σ 2 = 仝

Claims (1)

[Claims] The Uranami TIG welding filler metal used at the initial stage of welding one side of a workpiece includes a metal outer skin and a flux filled inside the outer skin, and the weight of the flux is equal to or less than the weight of the outer skin. 178 to 3/2 and contains at least 30% by weight of metal fluoride as a flux component, and 2 to 6% of a slag forming material based on the product weight as a flux component. Uranami TIG welding filler metal.