JPS58179585A - Method for welding vertical and horizontal composite members - Google Patents

Abstract

PURPOSE:To weld members having intricate shapes efficiently without any defect, by subjecting a vertical member to electroslag welding by using a small- diameter wire then subjecting a horizontal member to submerged arc or electroslag welding in succession. CONSTITUTION:A small-diameter wire 7 of 1.2-2.0mm. diameter is fed with a torch 6 inserted into the groove in the web part enclosed with a copper strap 18 and a copper backing strap 19 as a guide, and welding is started by conducting electricity to the wire 7. A flux is charged immediately after generation of an arc, and the arc welding is shifted to electroslag welding. The torch 6 is moved upward in the direction of an arrow 23 according to filling of molten metal 20 in the groove, ad when the welding progresses to the top end in the web part, the upward movement of the torch 6 is stopped. In succession, the torch 6 is moved in the direction of an arrow 24, and the flange part is welded. If the welding speed is high in this stage, submerged arc welding takes place and if the speed is low, electroslag welding takes place. No conveniences arise in either welding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for butt welding a composite member of horizontal and vertical members, such as T-shaped and L-shaped copper.

Centering S* of composite members such as T-shaped and L-shaped steel requires the use of two welding methods: vertical and downward centering, so an automatic welding method that continuously connects vertical and horizontal members at tI# is required. Despite the fact that several automatic welding methods have been proposed in Japanese Patent Publication No. 52-5456, etc., the CO2 semi-automatic welding method is generally used. be. For example, in the method proposed as an automatic welding method for composite members mentioned above, after bath welding using a fully consumable nozzle type electroslag welding method for vertical members, the consumable nozzle is moved horizontally to continuously weld horizontal members. There is a method of electroslag welding. However, in conventional consumable nozzle type electroslag welding, stable welding cannot be achieved unless the slag bath depth is maintained at about 40 mm.

Ninth, when implementing the above automatic welding method, in the process of welding from a vertical member to a horizontal member, a large amount of slag flows into the groove of the horizontal member prior to the horizontal movement of the wire, causing slag entrainment defects. There are drawbacks that can easily occur. In addition, in the consumable nozzle type electroslag welding method used in conventionally proposed methods, the distance between the consumable nozzle and the slag bath, the so-called dry extension, is usually as short as 0 to 5 mm, and the wire diameter is as large as 2.4 mm or more. Therefore, the wire melting rate per unit current is small, and it cannot be said that the merits of automation are so great compared to CO2 semi-automatic welding.

The present invention solves the drawbacks of such conventional methods and provides a highly efficient bath welding method that does not cause defects such as slag entrainment.The gist of the present invention is to butt weld vertical and horizontal composite members. In this method, a torch inserted into the groove is raised as welding progresses, and a diameter of 12 to 2.
After electroslag welding a vertical member using a 0-diameter wire, the torch is continuously moved horizontally without interrupting welding to perform submerged arc welding or electroslag welding of a horizontal member. # of vertical and horizontal composite members featuring! Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the method of the present invention.
FIG. 2, FIG. 3, and FIG. 4 are cross-sectional views illustrating the progress of welding when the method of the present invention is implemented.

In FIG. 1, 1 and 2 are base materials having an L-shaped cross section, 7 run portions 4 are horizontally placed on the bottom plate 3, and the web portions 5
The wire 7 is inserted into the groove of the web part of the base materials 1 and 2 with a 6#i torch and fed in from a wire feeding device (not shown). is guided to the welded portion of the torch 6. 8 and 9 are rollers that hold the torch 6 and move it up and down; a motor 1o;
driven by. The skeleton motor 1o is attached to a truck 14 via a support plate 11 and position adjustment members 12, 13, and the truck 14 is attached to a rail 15 that is placed parallel to the grooves of the flanges of the base materials 1 and 2. It is set up so that you can freely run along it. In addition, 16 is a feed handle for adjusting the positioning piece, 17 is a welding flux that covers the groove of the 7 run part, and 18 is a copper dowel that covers the groove surface of the web part.

Next, the embodiment with the above configuration is shown in FIGS. 1 to 4,
The process of welding progress will be explained one by one. First, in FIG. 2, the wire 7 is fed using the torch 6 inserted into the groove of the web portion surrounded by the copper butt 18 and the back copper butt 19 as a guide. When electricity is applied to the wrinkled wire, an arc is generated and welding begins.

After the arc is generated, flux is immediately added to continue welding by transitioning from arc welding to electroslag welding. 20 is a weld metal and 21 is a slag bath. As the groove is filled with weld metal 20, the holding rollers 8 and 9 are rotated in the direction of arrow 22, and the torch 6 is moved in the direction of arrow 2.
Raise it in the direction of 3. On the other hand, the slag adheres to the copper pads 18 and 19 and is consumed, so in order to maintain the depth of the slag bath 21 constant, additional flux is added to proceed with welding. 17 is the flux that has been sprayed in advance on the 7th rung part, and the IW on the flange part.
It is used for I&. Then, as shown in Figure 3, when the welding progresses to the upper end of the web part, the clamping row 28.9
stops rotating, and the trolley 14 equipped with the torch 6 is run along the rail 15 in the direction of the arrow 24 to weld the flange portion. 25 is a copper dowel used to form a rough surface when welding the 7-run part.0 Next, as shown in Figure 4, when the torch 6 reaches the welding point f26, the S class ends, so the bogie 14 , and the power to the wire 6 is also cut off.

In the above welding, first, the wire 6 used is a small diameter wire so that it can be easily melted even in a shallow slag bath, and the distance between the torch 6 and the slag bath 21 is long to promote the resistance heating effect of the wire 6. Weld as follows. In order to prevent slag entrainment when transitioning from web part welding to Franz part O welding, it is desirable that the depth Fi of the slag bath 21 in web part welding is 20- or less.
■In order to stably weld in the following slag bath, the diameter of wire 60 must be 2.0 mm or less), and considering the wire feedability, the lower limit of the diameter of wire 6 is 12 mm. To,
When welding the flange part, if the Ti welding speed is fast, it will be submerged arc bath welding, and if it is slow, it will be electro slab welding. However, either welding method does not deviate from the gist of the method of the present invention, and the same method can be used. It is effective and causes no inconvenience. In other words, when welding a thick plate in the 7th rung section in one layer on one side, it is appropriate to use electroslag welding because it increases the #i welding speed.On the other hand, when welding a thin plate, the welding speed is fast. Therefore, submersible arc IL1 class is more appropriate. In addition, if the flange plate thickness is thick, multi-layer welding may be performed by reciprocating the cart 14 at the 7-rung section, but in this case, the first layer is welded by submerged arc welding, and the second and subsequent layers are Welding produces a preheating effect on the base metal, making it easier for the flux to melt), and all of the injected flux becomes molten slag, so welding is performed by electroslag welding.

An example of welding conditions is specifically shown below.

Torch Diameter: 12 wires, Material: Copper, surface treated with insulation coating with heat-resistant rubber, wire diameter 1.6m, dwarf wire (C-81-
Mn-based flux Melting type flux S 102-
MnO base material specifications Franz part thickness 14m, web part thickness 12 ■Franz part length 100 Shishi web part length 40
0 ■Material: Mild steel Web part welding conditions (electroslag welding) Current 3 B
OA (DC), voltage 38v1, 40 dry extensions, slag bath depth 10m1, welding speed 6cm/m
ln.

Flange part welding conditions (submerged arc welding) Current 42OA (DC), voltage 38V, il contact speed 20c
m/min.

In addition to the above, when the plate thickness of the 7-run section was set to 19 mm, the O# contact conditions were: current 420 A (DC), voltage 38 v, welding speed 1 G Cl11/mln, and an electroslag welding state. W mentioned above! As a result of welding under r-contact conditions, highly efficient welding could be performed without defects such as slag entrainment at the intersection of the web portion and flange portion.

As the backing material for the 7-run section, only a copper pad is shown in the figure, but solid flux backing materials used in conventional single-sided welding, glass fiber tape laminated backing materials, and copper pads are also available. Of course, the same effect can be obtained by using a backing material made of gold and glass fiber chives. Furthermore, it is also effective to use a method of increasing the welding speed by scattering cut wire (a wire made of the same material as the wire cut into small pieces) or iron powder into the flange groove in advance.

As described above, according to the welding method of the present invention, members having complicated shapes can be welded with high efficiency and without producing defects, and the welding method has high industrial value.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the method of the present invention, and FIG.
4 to 4 are diagrams illustrating the progress of welding according to an embodiment of the method of the present invention. 1.2... Base material, 3... Bottom plate, 4... 7 run section, 5... Web section, 6... Torch, 7... Wire, 8, 9... Holding roller , lO... motor, 11.
...Support plate, 12゜13...Position adjustment member, 14...
・Dolly, 15...Rail, 16...Transfer handle for position adjustment, 17...Flux, 18...Copper dowel,
19... Back copper butt, 20... Weld metal, 21...
Slag bath, 22... Roller rotation direction, 23... Torch rising direction, 24... Torch traveling direction, 25... Copper dowel, 26... End tab.

Claims (1)

[Claims] In the method of butting vertical and horizontal composite members, a torch inserted into the groove is raised as welding progresses, and the vertical members are joined using a thin wire with a diameter of 1.2 to 2.0 mm. A method for welding vertical and horizontal composite members, which involves performing electroslag welding and then continuously moving the torch horizontally without interrupting welding to perform submerged arc welding or electroslag welding of the horizontal members.