JPS60255280A - Welding method - Google Patents

Abstract

PURPOSE:To suppress lounge mismatching to the minimum by giving a mechanical binding force to a lounge material, and specifying conditions of a tack welding, when tacking vertically the lounge material onto a horizontal skin material by a horizontal fillet welding, and thereafter, executing continuously regular welding. CONSTITUTION:A lounge material 5 is placed vertically on a skin material 4 provided horizontally so as to be movable in the direction as indicated with an arrow, and a torch 7 of a device for bringing the material 5 to regular welding against the material 4 is opposed and placed before and behind the material 5. Also, a torch 9 of a tack welding device 8 is placed in front of the device 6 of the direction of a weld like in the same way. Vertical and horizontal binding devices 11 and 12, and 13 and 14 for giving a mechanical binding force from the upper and horizontal directions are provided on the upper face of unwelded and welded sides of the material 5, also between the devices 6, 8, and on both side faces before and behind the material 5 of the welded side, respectively. In this state, the material 4 and 5 are moved in the direction as indicated with an arrow, and the tack and regular weldings are executed by giving the mechanical binding force by the devices 11-14. In this case, the tack welding in front of the welding direction of the regular welding is executed under each condition that a welding heat input quantity is 6.0-8.0KJ/cm, a tack pitch is 200-600mm., tack bead length is 20-50mm., the number of tack pieces of is >= two pieces, and terminal tack bead length is 100-200mm..

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a welding method for tack welding and main welding a longitudinal material onto a skin material by horizontal fillet welding.

[Prior art]

Conventionally, when assembling the skin material and longitudinal material in shipbuilding, the longitudinal material was placed vertically on the upper surface of the ten-skin material, and the longitudinal material on the skin material was manually moved to an arbitrary position. A method is adopted in which tack welding is performed at positions in an arbitrary order and then main welding is performed, and in this case, there is no particular problem with Roncine alignment.

However, when welding the longitudinal material sequentially from one end to the other while applying mechanical restraining force to the longitudinal material in the vertical and horizontal directions using a line welder, etc., adjustment occurs. That is, as shown in Fig. 1, the longitudinal material (2) placed vertically on the horizontal skin material (1) is temporarily (4) welded from the right end to the left end using the line welder welding device (3). Or, in the case of actual welding, longitudinal alignment △t will occur with respect to the length l of the longitudinal material (2).

The reason for this longine adjustment is that the rigidity and heat capacity of the longitudinal material (2) are smaller than that of the skin material (1).
This occurs because the thermal expansion caused by the welding heat in 2) is large and the state of free elongation is likely to occur. Depending on the method, etc., there are cases where main welding is performed without tack welding.

An effective way to reduce this longine adjustment is to perform tack welding in some way before the actual welding. However, even though this kind of solution has been made into an apparatus using a line welder apparatus, two steps of tack welding and main welding are required, which is inconvenient.

[Purpose of the invention]

This invention was made with the above points in mind,
The purpose is to perform tack welding and main welding at the same time, and to suppress Roncine alignment to a minimum f.

[Groove structure of the invention] This invention provides a welding method in which tack welding and main welding are sequentially performed by horizontal fillet welding of a longitudinal material vertically on a horizontally provided skin material, in which the longitudinal material has already been welded. Mechanical restraining force is applied to the upper surface and both side surfaces of the longitudinal material on the side and the unwelded side from the vertical and horizontal directions, respectively, and the welding heat input 6, o~s, o K J / cm This is a welding method characterized by performing tack welding under the following conditions: tack pitch 200 to 600 mm, tack bead length 20 to 50 mm, number of tacked pieces 2 or more, and bead length with end plate 100 to 200 mm.

〔Effect of the invention〕

Therefore, according to the welding method of the present invention, by tack welding under the above-mentioned conditions while attaching and holding the contract binding force on the top surface and both sides of the longitudinal material, main welding and By being able to perform tack welding and welding at the same time, alignment can be minimized.

〔Example〕

Next, this invention will be explained in detail with reference to the drawings from FIG. 2 onwards showing one embodiment thereof and experimental results.

First, in Figures 2 and 3, (4) is horizontal! The skin material (5) is provided vertically on the skin material (4), the left and right longitudinal material (6) is the skin material, and 4) the upper IC longitudinal material (5) is actually welded. MISA method f
It is a six-piece welding device, and each welding torch (7) is provided facing each other on the front and rear sides of the longitudinal material (5). (
8) is provided in front of the main welding device (6) in the welding line direction, that is, on the left side, and the longitudinal material (5) is placed above the skin material 14).
) is a preliminary tack welding device for tack welding, and each welding torch (9) is provided facing the front and rear sides of the longitudinal material (5).

(11) and θ are vertical restraint devices that apply mechanical restraint from one side to the upper surface of the longitudinal material (5) on the unwelded side and the welded side, 03 and θ4) are surface welding devices (6), (
8) It is a horizontal restraint device that applies mechanical restraint force to the front and rear sides of the longitudinal material (5) on the welded side.Each restraint device is 0υ# O'211 (13, Q4)! /C mari longe material (5) is held.

Then, as shown in FIG. 2, the skin material 44) and the longitudinal material (5) are moved in the direction of the arrow, and each restraint device (1])
, θ, θ3, 04), tack welding and main welding are performed while applying mechanical restraining force to the longitudinal member (5) from the vertical and horizontal directions, respectively. During this operation, the vertical restraint device (11) on the unwelded side prevents vertical bending deformation of the longitudinal material (5), prevents the generation of a gap between the longitudinal material (5) and the skin material (4), and horizontally restrains the longitudinal material (5). The device 03 prevents horizontal bending deformation and sideways falling of the longitudinal material (5), and the horizontal restraint device θ4) on the already welded side prevents the longitudinal material (5) from falling sideways, and prevents the longitudinal material (5) from falling sideways. The vertical restraint device 0 acts as a reaction force against the deformation restraint force caused by the vertical restraint device 0, and furthermore, the vertical restraint device 0 prevents the longitudinal material (5) and the skin material (4) from springing up after welding is completed.

Next, we will show the experimental results when tack welding and main welding were actually performed simultaneously in the manner described above. Here, the distance from the main welding device (6) to the tack welding device (8) is L1, the tack pitch is P1, and the number of tack beads is n.

As shown in Table 1, when tacking conditions are set for each type of slag longitudinal, the longitudinal alignment for the welding position is as shown in FIG. 4. Note that A in FIG. 4 shows the case where a 150 x 12 t slag longitudinal was welded without temporary welding.

Table 1 In addition, as shown in Table 2, when plate attachment conditions are set for the T longitudinal and L20 longitudinal, the longitudinal alignment with respect to the welding position is as shown in Figure @5. H1 5th
In the figure, B and C are each 645
, 150 x 30t T longe and 400 x 1
Table 2 shows the case where a 3t, 150 x 12t L20 piece was actually welded without tack welding.

Therefore, according to the above experimental results, the conditions for tack welding that minimize the longitudinal alignment of the longine material (5), which is used in ship ditch construction but has low rigidity, and the slug longitudinal of Sunawachi 150 x 12 to 15 tons are ( 1) Heat input for tack welding 6.0~7.0KJ/Cm (11) Tack welding pitch 300mm or less (110 tack bead length 20~5Qmm 0 success bead length with end plate 100~200mm (X/) tack number 2 pieces This tack-welding condition may be relaxed for longitudinal sizes with high rigidity, but if welding is performed under the above conditions, it is possible to minimize longitudinal alignment for all longitudinal sizes. It is possible.

[Brief explanation of drawings]

Figure 1 is a front view of the conventional welding method, Figure 2 and the following drawings show an embodiment of the welding method of the present invention, Figure @2 and @
Figure 3 is a front view and side view of the main parts during welding, and Figures 4 and 5 are diagrams showing the relationship between the welding position and Roncine alignment, respectively. t4)...skin material, (5)...longi material. Agent: Patent attorney Ryuta Fujita Department: Figure 4: Dormitory employee (m) Figure 5: A1 Hibiki (m)

Claims (1)

[Claims] ■ In a welding method in which a longitudinal material is vertically disposed on a horizontally provided skin material by horizontal fillet welding, tack welding and main welding are sequentially performed, the welded side and the unwelded side of the longitudinal material are Mechanical restraining forces are applied to the upper surface and both side surfaces of the longitudinal material on the welding side from the vertical and horizontal directions, respectively, and the welding heat input is 6.0 to 8. OKJ/Cm A welding method characterized by performing tack welding under the following conditions: tack pitch 200 to 600 mm, tack bead length 20 to 5 Qmm', number of tack welds 2 or more, and bead length with end plate 100 to 200 mm.