JPS6137372A - Both-side fillet welding method - Google Patents

Abstract

PURPOSE:To omit a preparation work, to reduce labor, to improve the productivity, and to stabilize a quality by forming the bottom face of a stiffener to an inclined cut shape, constraining the stiffener at the time of welding, and securing a vent space in the welding advance direction. CONSTITUTION:A stiffener 2' is constrained by providing at least in the forward direction of a welding machine a horizontal constraining roller 7 of a horizontal constraining device for constraining by a horizontal direction force from both side of the stiffener 2', and a vertical constraining roller 8 of a vertical constraining device for pressing from the upper part in order to execute continuously face-sticking of the stiffener 2' and a plate 1. Also, when both-side fillet welding is executed on the plate 1 by cutting diagonally the bottom face being a weld zone of the stiffener 2' side as a pit resistance countermeasure, a space through which a harmful gas escapes is provided in the welding advance direction, without peeling off a paint 3 of a welding part of the plate 1 side. In this way, by constraining the stiffener 2' whose bottom face has been brought to inclined cut, such a preparation work as tack welding is omitted, and the both-side fillet welding can be executed continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a panel manufacturing method in the shipbuilding industry, etc., in which a stiffener is welded to a flat plate.

(Prior art and problems) Conventionally, in panel manufacturing, flat plates were coated to prevent rust.
However, since this paint generates harmful gases during welding and can cause pits, be sure to use a sander etc. to remove the paint from the weld joint and its surroundings before welding, and then repair. The rigid materials are placed along the marked lines drawn on the flat plate, and appropriate tack welding is done manually to maintain the position, and the actual welding is then carried out by semi-automatic welding.

Figure 1 shows the work procedure of the conventional method, (a) is the work of scraping the bottom plane cut stiffener 2 installation position, (b) is the stiffener 2
Paint removal work on the flat plate l at the welding point, (C) is stiffener setting work, (d) is tack welding work to maintain the stiffener position, (e) is heavy welding work. show.

FIG. 2 shows how the welding is performed at the joint between the flat bottom cut stiffener 2 and the flat plate 1 in the conventional method after the paint is removed from the welded area on the flat plate side. Note that 3 indicates the paint and 4 indicates the fillet welding speed.

With the conventional method, the time and effort required for paint stripping work cannot be ignored, and the work environment is poor due to dust scattering during paint stripping, and the time and effort required for tack welding work cannot be ignored. However, there were disadvantages such as the peeling condition caused by the manual work of stripping the paint on the flat plate and the alignment work of the stiffener, and variations in product quality such as stiffener pitch and collapse.

(Objective of the Invention) The present invention is intended to solve the conventional problems, and eliminates the work of stripping paint and tack welding of flat plates, mechanizes the position of stiffeners and maintains the upright posture, and eliminates harmful gases. The purpose is to stabilize the quality of welded parts, ensure dimensional accuracy, and improve productivity by securing space.

(Structure of the Invention) The present invention provides a panel manufacturing method in which a vertical stiffener is joined to a horizontally provided flat plate by fillet welding, in which the bottom surface of the stiffener is cut in an inclined shape and the stiffener is welded. Continuous fillet welding on both sides, which is characterized by welding while holding the position of the stiffener by restraining it from both sides and the upper surface, securing a space for venting harmful gas, and venting gas in the welding direction. It's a method.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

Fig. 3 shows the welded joint parts of the present invention, and the stiffening material 2 is used as a pit-proof measure without peeling off the paint 3 at the welded parts on the flat plate side.
Cut the bottom surface, which is the welding part on the ' side, diagonally (approximately 3
~5°) This indicates that a space was provided for harmful gases to escape in the direction of welding progress when performing fillet welding on both sides to a flat plate.

FIG. 4 shows the state after the bottom inclined cut stiffener 21 of the present invention is welded without restraint, and it is found that the stiffener is collapsed, indicating that restraint is necessary. In this way, in order to maintain the upright posture and horizontal position of the stiffener with an inclined bottom cut that is easy to fall over, and to ensure a continuous space for gas venting,
As shown in Fig. 5, the horizontal restraining rows 27 of the horizontal restraining device restrain the stiffener 2' by horizontal force from both sides, and the horizontal restraining rows 27 of the horizontal restraining device restrain the stiffener 2' from above in order to continuously bring the stiffener and the flat plate into contact with each other. Vertical restraint rows 28 of the vertical restraint device are arranged at the front and rear of the welding machine or only at the front. In this way, fillet welding on both sides of the bottom inclined cut stiffener can be performed continuously while restraining the bottom cut stiffener, thereby making it possible to perform fillet welding on both sides of the bottom cut stiffener at the joint.

・Figure 6 shows one of the devices for carrying out the welding method of the present invention.
As an example, the workpieces (stiffener 2' and flat plate 1) are welded by the welding machine 9 while being transferred on the traveling rail 14 by the workpiece transfer wheel 13. The unit frame 15 suspends a welding machine 9, welding auxiliary equipment (wire supply device 10, flux supply device 11, slag recovery device 12, etc.), a horizontal restraint device 5, and a vertical restraint device 6, and stiffens each restraint device. A vertical restraining row 28 and a horizontal restraining row 27 are provided in the portion that is in direct contact with the material so that continuous restraining welding can be carried out without difficulty.

(Effects of the Invention) As explained above, according to the present invention, it is possible to omit setup work such as peeling off paint, pre-board welding, and positioning, thereby reducing labor, improving productivity, and stabilizing quality. There is a lot to contribute.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the conventional method. The second cause is a diagram showing a welded joint part of the conventional method. Figure 3 is a diagram showing a welded joint part of the present invention. Figure 4 is a diagram showing a welded joint part of the present invention. FIG. 5 is an explanatory diagram of the welding method of the present invention; FIG. 6 is a schematic diagram showing an embodiment of a device for carrying out the welding method of the present invention. . 1: Flat plate, 2: Stiffener with flat bottom cut, 2': Stiffener with sloped bottom cut, 3: Paint, 4: Fillet weld bead, 5:
Horizontal restraint device, 6: Vertical restraint device, 7: Horizontal restraint roller, 8. Vertical restraint roller, 9: Welding machine, 10: Wire supply device, 11: Flux supply device, 12 Varnish slag recovery device, 13: Workpiece transfer trolley, 14: Traveling rail, 15
：Unit frame agent Patent attorney Masa Akizawa Mitsugai 2 people

Claims (1)

[Claims] In a panel manufacturing method in which a vertical stiffener is joined to a horizontally provided flat plate by fillet welding, the bottom surface of the stiffener is cut in an inclined shape, and the stiffener is welded. A double-sided fillet welding method characterized in that welding is performed while restraining from both sides and the upper surface of the welding part to allow gas to be vented in the direction of welding progress.