JPH0675786B2 - Multi-layer automatic welding method for column joints with curved corners - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-layer automatic welding method for a column joint having a curved corner portion.

The column joint is formed by cold bending, and square steel pipes with curved parts with small radii of curvature at the four corners are cut into short pieces for the joint of buildings, and a diaphragm is welded to both ends of the pipe. Produced.

[Conventional technology]

Diaphragm installation automatic welding of the column joint is performed by horizontally moving the welding torch mounted on the manipulator etc. on the flat part of the column and rotating the column joint by the positioner etc. on the curved part of the column corner while interlocking with this. The welding torch is moved along the movement locus of the portion to be welded, and the downward automatic welding is continuously performed while repeating these operations.

Regarding the welding control of the curved corner portion, which is important in this welding method, in Japanese Patent Application No. 63-210825, a column surface contact type angle detector, that is, the difference in height between the surface-tracing roller 1 and the height roller 2 shown in FIG. 6 ( By detecting (h ₁ −h ₀ ), the rotation start position of the column joint portion in the welding of the corner curved surface portion 3 is detected, and during the rotation of the column joint portion, the height difference (h ₁ −h _{0) of the} rollers is detected. ) Is kept constant to control the target position 5 of the welding torch 4 on the curved surface.

In this method, the position at which the column joint is rotated (the position in FIG. 6 (b)) and the welding torch position 5 in rotation (FIG. 6 (c)) are the positions where the tangent line 6 of the curved surface to be welded is inclined forward. Is appropriate.

As shown in FIG. 7, when the plate thickness t of the column becomes large, that is, when the number of weld layers increases, even if the torch aiming position 5 in the first layer weld 7 is the proper position of the forward inclination, as the number of layers advances, Since the torch aiming positions 5a, 5b, 5c, ... are displaced with respect to the proper positions 8a, 8b, 8c, ... on the tangent lines 6a, 6b, 6c, ... with appropriate forward inclination, defects are formed inside and outside the welding bead. At the same time as it occurs, molten metal sags down and welding becomes impossible.

[Problems to be Solved by the Invention]

The present invention, in the automatic continuous multi-layer welding of the column joint,
It is an object of the present invention to provide a technique for obtaining a healthy and beautiful-looking welded portion while automatically correcting and controlling the welding torch position as the number of welded layers progresses.

[Means for Solving the Problems]

The present invention relates to a method for multi-layer welding of a column joint portion having a curved surface at a corner portion in automatic continuous multi-layer welding of a column joint portion. Using the height detection roller preceding the
The present invention is characterized in that the column rotation proper start position in the column corner portion that changes for each welding layer is detected and the operation of the welding torch during rotation is controlled by the height difference between the two rollers.

Instead of modifying the horizontal distance between the shafts, the horizontal distance in the traveling direction between the surface tracing roller and the welding torch may be changed for each welding layer.

[Action]

According to the present invention, in the welding of the corner curved surface portion of the column joint portion, as shown in FIG. 5, the target position 5 of the welding torch 4 has the same front inclination tangent lines 6, 6a, 6b, 6c in each welding layer. Correspond to the proper positions 8, 8a, 8b, and 8c which are respectively in contact with.

〔Example〕

The rotation start position of the column joint in welding the corner will be described.

FIG. 1 is an explanatory view of the first layer welding, in which the surface contouring roller 1 and the height detection roller 2 are combined at a horizontal axis distance l ₀ , and the welding torch 4 is at the same position as the surface contouring roller 1 in the traveling direction. They are fixed, and at the flat part of the column, they are integrated and move horizontally in the direction of arrow 9, and when they reach the curved surface of the corner, the height difference between the follower roller 1 and the height detection roller 2 widens, and h ₁ When it reaches, the column connector 10 starts to rotate by a positioner (not shown) or the like.

This rotation starts when the target position 5 of the welding torch 4 coincides with the proper position 8 where the tangent line 6 which is the forward inclination is in contact, and preset values, that is, the plate thickness t of the column, the surface curvature 11 of the column, and the inter-roller distance l ₀ It is possible to calculate the height difference (h ₁ −h ₀ ) of the roller when the welding torch reaches the proper position 8 (the same position as the aiming position 5). Give instructions.

FIG. 2 is an explanatory view of the second layer welding, and shows the rotation start position 8a of the column joint portion in the corner welding of the second layer welding 13 to be welded on the first layer welding 12. When the target position 5a of the welding torch 4 coincides with the proper position 8a where the tangent 6a on the surface of the first-layer weld bead having the same forward inclination as the tangent 6 of the curved surface portion of the first-layer weld 12 contacts, the height of the rollers 1 and 2 is lowered. Difference (h ₁ −h ₀ )
When this is detected, a rotation instruction is given to the positioner. In order to correct the deviation 14 of the horizontal portion between the proper position 8 of the welding torch aiming at the first layer welding and the proper position 8a at the second layer welding, the surface at the stage where the first layer to the second layer welding is changed. The inter-axis horizontal distance between the profile roller 1 and the height detection roller 2 is narrowed from l ₀ to l ₁ . In this case, the narrowing amount (l ₀ −l ₁ ) of the inter-roller distance corresponding to the shift amount 14 can be calculated by setting the height 15 of the first layer welding in addition to the above-mentioned set value.

In this way, if the horizontal distance between the rollers is appropriately changed for each welding layer so that the electrode aiming position of each welding layer is appropriate, all of the welding layers will be sound with no dripping of molten metal in the corner welding. Beautiful welding is possible.

Up to now, the method of controlling the corner welding at the start and during the rotation of the column joint has been described with the roller height difference being a constant value for each welding layer. Generally, as shown in FIG. The rotation start position of the column joint in welding is assumed to be when the angle 18 formed by the connection 17 between the height detection roller 2 and the column surface curvature core 16 and the vertical line reaches a certain value, and the welding torch is aimed at the first layer. On the vertical line of the proper position 8 on the vertical line of the proper position 8a of the torch aiming at the inter-roller axial distance l ₀ so that the roller 1 is positioned on the vertical line of the proper position 8 and on the surface of the first layer weld 12 in the second layer welding. In order to position the surface-following roller to l ₁ , the distance between the axes of the rollers is set to l ₁ , that is, the amount 14 of horizontal deviation between the proper positions 8 and 8a is subtracted from l ₀ (l ₁ = l ₀ −deviation amount). You should fix it. It is sufficient to instruct the start of rotation of the column when the roller height difference reaches h ₁ during the first layer welding, and when the roller height difference reaches h ₂ during the second layer welding. In this case, as described above, since the plate thickness of the column, the surface curvature of the corner portion, the distance between the rollers, the angle 18, the proper positions 8 and 8a for aiming the torch, etc. can be set in advance, the height differences h ₁ and h _{2 of the} rollers can be set. Can be easily calculated.

FIG. 4 is a diagram illustrating a method of moving the welding torch. Weld the first layer welding by keeping the axial distance l ₀ between the surface-following roller 1 and the height detection roller 2 always constant, and by making the column port start rotating whenever the roller height reaches h _1. In the second layer welding, the welding torch 4 aiming at the proper position 8 is aimed at the proper position 8a, and the welding torch 4 is moved forward by the horizontal shift amount 14 of the proper position. In this way, if the welding torch is horizontally moved to the final welding layer for each layer by a necessary horizontal displacement amount, a sound and beautiful bead can be obtained for each welding layer.

〔The invention's effect〕

According to the multi-layer welding method of the present invention, since the target position of the welding torch at the corner curved surface of the column is matched to the proper position for each layer of welding to perform column welding, sound welding can be ensured. It is possible to completely prevent welding defects and dripping.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of the present invention at the time of initial layer welding, and FIG. 2 is an explanatory view of an embodiment of the present invention at the time of welding of a second layer, FIG.
FIG. 4 is an explanatory view of the movement of the torch, FIG. 5 is an explanatory view of the operation of the present invention, and FIGS. 6 and 7 are explanatory views of the prior art. 1 …… Surface tracing roller 2 …… Height detection roller 3 …… Corner curved surface 4 …… Welding torch 5 …… Target position 6 (6a, 6b, 6c) …… Tangential line 7 …… First layer welding 8 (8a, 8b, 8c) …… Proper position 9 …… Horizontal movement 10 …… Column joint 11 …… Column surface curvature 12 …… First layer welding 13 …… Second layer welding 14 …… Displacement 15 …… First layer welding Height 16 …… Column surface curvature center 17 …… Connection

Claims (2)

[Claims] Claim: What is claimed is: 1. In automatic continuous multi-layer welding of column joints, a surface-rolling roller that rolls on the surface of the column and a height-detecting roller preceding the surface-rolling roller are used, and the horizontal distance between the axes is determined by each welding. The correction is performed for each layer, and the column rotation proper start position in the column corner portion that changes for each welding layer is detected by the height difference between the two rollers, and the operation control of the welding torch during the rotation is performed. Multi-layer automatic welding method for column joints that have curved corners. 2. The curved surface of the corner portion according to claim 1, wherein instead of correcting the horizontal distance between the shafts, the horizontal distance in the advancing direction of the surface following roller and the welding torch is changed for each welding layer. Method for automatic multi-layer welding of column joints having a.