JPH0739036B2 - Multi-layer automatic welding equipment for pile joints - Google Patents

Description

TECHNICAL FIELD The present invention relates to a multi-layer automatic welding device for pile joints.

"Problems to be solved by conventional techniques and inventions" In general, piles are piled into the ground as long piles by welding and unifying the piles at their end joints with an automatic welding machine. Have been implemented in.

Therefore, as such a welding method, conventionally, it is general to perform multi-layer welding by a semi-automatic or fully automatic welding machine,
In the case of multi-layer welding of piles, a single arc welding torch attached to a traveling device that turns around the pile is swiveled around the welding groove created by abutting the joints between the upper and lower piles. While raising the weld metal of the first layer over the entire circumference, and then turning one arc welding torch around the groove again, stacking it on the weld metal of the first layer The current situation is that welding is carried out by a multi-step operation in which the whole of the circumference is raised.

However, in such multi-step welding, the welding torch is swung two or more times in one multi-layer welding, and the slag formed on the surface after the first welding is removed, and the position of the welding torch is further adjusted. Since the work of welding the second layer is involved, there is a problem that the welding work is complicated and time-consuming, and the work efficiency is poor.

Therefore, conventionally, two welding electrodes with different current intensities were attached to a driving frame that is driven and driven along a guide rail provided around the pile at predetermined intervals in the traveling direction, and the welding electrodes together with the driving frame were connected to the pile joint part. Before the welding slag welded by the welding electrode located in front of the direction of rotation of the groove is hardened, the welding metal of the next layer is piled up on the welding slag by the subsequent welding electrode to raise the deposited metal of the next layer. Multi-layer welding is completed by rotating the welding electrode once or more,
Moreover, there is known a welding apparatus that enables extremely simple welding of piles without the need for removing slag and adjusting the position of the welding torch (Japanese Patent Publication No. 53-34168).

However, in this multi-layer welding device, it is described that the tip position of the welding electrode can be adjusted up and down and the angle of up, down, left and right can be adjusted, but its specific structure is not clear.

On the other hand, a slider that can be slidably adjusted in the front-back direction (radial direction of the pile) is provided on the traveling platform that travels along the rails provided around the pile, and an arc-shaped guide rail is mounted upward on the slider. An automatic welding device is also known, in which a support for one welding nozzle is slidably mounted on a rail, and the tip position of the welding nozzle with respect to the groove is adjusted by the forward / backward movement of the slider and the vertical circular movement of the support. However, with this device, it is necessary to position and fix the position of the rail for the traveling platform accurately with the tip of the welding nozzle aligned with the welding groove. There is a problem that the angle of the nozzle becomes constant due to the slide position of the arc-shaped guide rail of the support table, and the angle cannot be adjusted freely,
In addition, the left and right position adjustment of the welding nozzle and the left and right angle adjustment were not possible.

[Means for Solving Problems] In order to solve the above-mentioned conventional problems, the present invention provides a turning traveling device 5 that automatically travels along a guide rail 4 provided around a pile, at predetermined intervals in the traveling direction. Elevating rods 8 and 8'are vertically adjustable, and automatic arc welding torches 11 and 11 'are provided at the lower ends of the elevating rods 8 and 8'at predetermined intervals along the turning direction of the turning traveling device 5. Fixed torch holders 12, 12 'are attached.
Each of the bases 12 'is slidably attached back and forth to an advancing / retreating guide 13 horizontally projecting from the lower end of the elevating rods 8 and 8'to a rack 14 formed on the advancing / retreating guide 13 on the base end thereof. The meshing pinion gear 15 is rotatably supported,
The arc welding torches 11 and 11 'are tightly fixed between the narrowing board 18 and the narrowing board 18' attached to the left and right by fastening bolts so as to face the pile circumferential side. Substrate 18
The fixing rods 20 vertically projecting from the rear surface of the tongue holding base 12 and 12 'are respectively attached to the narrowing board 21 and the narrowing board 21' which is vertically opposed to the narrowing board 21 and is attached by the fastening bolts 22. Narrow substrate 2 that is tightly attached to the torch holders 12 and 12 '
1 proposes a multi-layer automatic welding device for a pile joint part which is attached to the torch holders 12 and 12 'by a fastening screw 23 so that the angle can be adjusted in the horizontal direction.

[Operation] After fixing the guide rail 4 to the proper position of the pile 1, the vertical position of the left and right arc welding torches 11, 11 'with respect to the welding groove 24 can be freely adjusted by the vertical adjustment of the vertical lifting rods 8, 8'. The front and rear positions of the arc welding torches 11 and 11 'can be adjusted by rotating the pinion gear 15 and adjusting the torch holders 12 and 12' through the rack 14 of the advancing / retreating guide 13 in the longitudinal direction.

The vertical elevation angle of the arc welding torches 11 and 11 'and the tip position of the arc welding torches 11 and 11' are fixed to the torch holders 12 and 12 ', respectively, by fixing rods 20 protruding vertically to the rear surface of the narrow substrate 18.
It can be arbitrarily adjusted by adjusting the angle between the narrowing board 21 attached to and the narrowing board 21 'which is vertically opposed to the narrowing board 21 and attached by the fastening bolts 22.

Further, the horizontal angle of the arc welding torches 11 and 11 ′ and the distance between the tips of the arc welding torches 11 and 11 ′ are such that the narrow substrate 21 is attached to each torch holder 1.
It can be adjusted by adjusting the angle in the horizontal direction with the fastening screw 23 with respect to 2, 12 '.

Therefore, by adjusting the above parts, the arc welding torch 1
1, 11 'can be properly adjusted with respect to the welding groove 24 in vertical, front-rear, left-right positions and vertical and horizontal angles, and the tip intervals of the both, particularly the arc welding torch located forward in the turning direction. It is possible to set 11 so that the tip position is deeper than the welding groove 24 with respect to the arc welding torch 11 'located behind it.

"Example" Hereinafter, an example of the present invention shown in the drawings will be described.
The figure shows a fully automatic welding apparatus for piles according to the present invention, in which a fixing base 2 is attached by fixing screws 3 around an upper pile 1 in which a lower end joint portion is superposed on an upper end joint portion of a lower pile 1 '. A turning traveling device 5 is attached to a guide rail 4 which is attached to the outer periphery of the fixed base 2 and which is in the form of a split annular ring so as to freely turn.

The turning traveling device 5 engages the upper and lower wheels 6 attached to the rear surface thereof with the upper and lower sides of the guide rail 4, and rotationally drives the intermediate drive pinion wheel 7 that meshes with the rack on the surface of the guide rail 4 to rotate the upper pile 1. Is configured to turn around.

Lifting rods 8 and 8'are slidable on the turning traveling device 5,
In addition, a pair of left and right sleeves 10 and 10 'are inserted by adjusting handles 9 and 9'to be adjustable up and down, and the lower ends of the lifting rods 8 and 8'are semi-automatic (fully automatic).
A torch holder 12,1 in which arc welding torches 11,11 'are fixed at predetermined intervals along the turning direction of the turning device 5.
2'is installed.

The torch holders 12 and 12 'are slidably attached to the forward and backward guides 13 whose base ends are horizontally projecting forward of the lower ends of the elevating rods 8 and 8', and are attached to the forward and backward guides 13 on the base ends thereof. A pinion gear 15 that meshes with the formed rack 14 is rotatably supported, and a support shaft 16 of the pinion gear 15 is provided.
Is rotated by a rotary knob 17 so that it can be moved forward and backward to finely adjust the forward and backward positions of the tip of each arc welding torch 11, 11 '.

The arc welding torches 11, 11 'are tightly fixed between the narrowing board 18 and the narrowing board 18', which is attached to the left and right sides of the narrowing board 18 by fastening bolts 19 with the tip facing the pile circumferential side. The fixing rod 20 vertically protruding from the back surface of the narrow board 18 is attached to each of the torch holders 12 and 12 ′, and the narrow rod 21 is vertically attached to the narrow board 21 by fastening bolts 22. Dressing board 2
Each arc welding torch 1 by sandwiching between 1 '
It is fixed so that the vertical elevation angle of 1,11 'can be adjusted.

Further, the narrow board 21 is attached to each of the torch holders 12 and 12 'by fastening screws 23 so that the angle can be adjusted in the horizontal direction.
As a result, the arc welding torches 11, 11 'can be fixed by adjusting the horizontal installation angle.

Using the fully automatic welding machine configured as above, the lower pile 1 '
When performing welding between the upper pile 1 and the upper pile 1 placed thereon, a fixed base 2 is attached around the upper pile 1, and the fixed base 2 is attached.
The turning traveling device 5 is attached to the guide rail 4 of FIG.

Next, the vertical position, front-back position, horizontal direction, and vertical angle of each arc welding torch 11, 11 ′ provided in the turning direction of the turning traveling device 5 are determined by the vertical and forward / backward movements of the torch holders 12, 12 ′. The adjustment mechanism and the horizontal and vertical angle adjustment mechanisms properly adjust the welding groove 24. In particular, the arc welding torch 11 located in the front in the turning direction is welded at the tip position more than the arc welding torch 11 'located behind it. Set so that it is deeper than the groove 24.

After the welding preparation work is completed in this way, the traveling speed of the turning traveling device 5 is adjusted, the start switch is turned on, the turning traveling is started, and at the same time, the welding power source is turned on in conjunction with this, and each arc welding torch is started. 11, 11 'start welding while rotating around the groove 24 in parallel.

At this time, the preceding arc welding torch 11 deposits the deposited metal of the first layer, and the subsequent arc welding torch 11 'deposits the deposited metal of the second layer before the slag on the surface of the deposited metal does not harden. It is essential to carry out the above, and the interval between the arc welding torches 11 and 11 'and the turning traveling speed are appropriately adjusted at such timing.

In this way, the arc welding torch 11,1
When the start switch is turned off after 1'turns once, the welding power supply automatically turns off at the same time, and the multi-layer welding is completed in one turning pass.

In the above embodiments, two arc torches are provided side by side, but two or more torches can be used for multi-layer welding of two or more layers.

Experimental example Using two steel pipe piles with a diameter of 700 mm and a plate thickness of 16 mm, a U-shaped groove (bottom R = 3 mm) with a throat thickness of 12 mm and a tip opening width of 11.0 mm was formed around each joint end. Multi-layer welding was performed depending on the conditions.

Interval between torch 11,11 '... 50 to 100 mm Arc current of torch 11 ・ ・ ・ 300 to 500 A 〃 voltage ・ ・ ・ 26 to 30 V Torch 11 ′ arc current ・ ・ 250 to 500 A 〃 voltage ・ ・ ・ 26 ~ 30V Traveling speed of turning device 5 ・ ・ 25〜50cm / min Welding wire ・ ・ 3.2mm diameter non-gas shielded wire As a result, the mechanical performance (bending, tensile strength, etc.) of the welded part is the standard of body material SS-41. And a good welding effect was obtained without fracture of the welded portion.

[Advantages of the Invention] As described above, according to the present invention, the multi-layer welding can be completed only by turning the arc welding torch provided side by side once, and moreover, the removal of the slag and the welding layers are stacked as in the conventional case. It is possible to weld piles very simply and efficiently in a short time without adjusting the position of the welding torch.

Then, the arc welding torches 11, 11 ′ can be appropriately adjusted with respect to the welding groove 24 in the vertical, front-back, left-right, vertical and horizontal angles, and the tip distance between the two.
In particular, the arc welding torch 11 located forward in the turning direction can be set such that the tip position is deeper than the arc welding torch 11 ′ located behind the arc welding torch 24.

Further, the arc welding machine is economical because a general-purpose semi-automatic welding machine can be used.

[Brief description of drawings]

FIG. 1 is a front view showing an example of the welding apparatus of the present invention, and FIG.
The figure is a vertical sectional side view showing the use state of the welding apparatus of the present invention,
FIG. 3 is a plan view of the same. 1 …… Upper pile, 1 ′ …… Lower pile, 2 …… Fixed base, 3 ……
Fixing screw, 4 ... Guide rail, 5 ... Turning traveling device,
6 ... wheels, 7 ... drive pinion wheels, 8,8 '... lift rods, 9,9' ... adjustment handle, 10 ... sleeve, 11,
11 '... Arc welding torch, 12, 12' ... torch holder, 13 ... advance / retreat guide, 14 ... rack, 15 ... pinion gear, 16 ... spindle, 17 ... rotary knob, 18 ... Narrow board, 18 '... Narrow board, 19 ... Fastening bolt, 20 ... Fixing rod, 21 ... Narrow board, 21' ... Narrow board, 22 ... Fastening bolt, 23 ... Fastening screw , 24 …… Welding groove.

Claims (1)

[Claims] 1. An elevating rod is attached to a turning traveling device that automatically travels along a guide rail provided around a pile so that the elevating rod is vertically adjustable at predetermined intervals in the traveling direction, and an automatic arc is provided at the lower end of each elevating rod. A torch holder is fixed to the welding torch at predetermined intervals along the turning direction of the turning device, and each torch holder has its base end horizontally projected forward and backward from the lower end of the lifting rod. A pinion gear, which is slidably attached to the guide in the front-rear direction, is rotatably supported on the base end of the guide, which meshes with a rack formed on the advancing / retreating guide. The narrowing plate is attached to the narrowing plate, and the fixing rods vertically projecting from the rear surface of the narrowing substrate are attached to each of the trays. The narrow board attached to the torch holder is sandwiched between the narrow board attached to the torch holder and the narrow plates attached to the torch holder vertically opposite to each other. On the other hand, a multi-layer automatic welding device for pile joints, characterized in that it is attached by fastening screws so that the angle can be adjusted in the horizontal direction.