JPH0679454A - Manufacture of large-sized angle for hot dip galvanizing - Google Patents

Abstract

PURPOSE:To simplify the manufacturing work, to reduce the manufacturing cost, and to prevent a welding defect and deformation, etc., in the manufacturing method for a large-sized angle used by performing hot dip galvanizing, as a member of a power transmission steel tower, etc. CONSTITUTION:Two pieces of steel plates 2, 3 formed by inclining the center part in the width direction of a steel plate by 45 degrees and cutting it are abutted in an L-shape, and both butted ends are subjected to partial penetration welding, by which a large-sized angle 1 is manufactured. In partial penetration weld zones 4, 5, a groove is worked in advance, and depth d1', d2' of the partial penetration weld zones 4, 5 continued in the member longitudinal direction is set to >=(1/4) T', respectively against width T' (=2<1/2>T:T is plate thickness of the steel plates 2, 3) of the butted face. Also, as for the end part in the longitudinal direction of the large-sized angle 1, the partial penetration weld zones 4, 5 are closed up completely by seal welding, and an intrusion of zinc at the time of hot dip galvanizing is obstructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a large-sized angle member to be used after being subjected to hot dip galvanizing in a power transmission tower or the like.

[0002]

2. Description of the Related Art For example, L300 × 35 (width of both sides 30
Large-sized angle materials with a thickness of 0 mm or more and a thickness of 35 mm or more have conventionally been manufactured as a custom-made product at a steel mill using rolling rolls.

In addition, a groove 2 is provided as shown in FIG.
Attempts have been made to weld the end portions of the steel plates 22 and 23 by vertically and horizontally abutting each other to form a large angle member 21,
Further, as shown in FIG. 5, steel plates 32, 33 cut diagonally
Method of forming a large-sized angle member 31 by facing the inclined cut surfaces of No. 1 and forming a large angle member 31 by substantially I-shaped narrow groove welding (Japanese Patent Publication No. 43600/1990).
(See Japanese Patent Publication).

[0004]

When a custom-made product is produced by using rolling rolls, there is a problem that it is very expensive due to a small production amount and it takes time to obtain it.

The above-described method of FIG. 4 is difficult to put into practical use due to problems such as easy deformation of members due to local strain associated with shrinkage of the weld metal and asymmetric complete penetration welding.

Although the methods of FIGS. 4 and 5 are so-called complete penetration welding, there are many problems in terms of cost and workability in addition to the large amount of welding, which complicates the preparation of work in manufacturing.

The present invention relates to a method for manufacturing a large-sized angle material to which hot dip galvanizing is applied, and its purpose is to simplify the manufacturing work, reduce the manufacturing cost, and prevent welding defects and deformation.

[0008]

The method for producing a large angle member for hot dip galvanizing according to the present invention uses partial penetration welding instead of complete penetration welding which has many problems as described above. By providing a groove having a predetermined depth continuous in the longitudinal direction of the member at both ends of the position where the steel sheet is formed, and partially melting and welding this portion, the two steel plates are integrated into an L shape.

As a form for integrating two steel plates into an L-shape, two steel plates each having an inclined surface of approximately 45 degrees formed on one side are butted against each other in an L-shape. There is a type in which the ends of a single steel plate are butted against each other in an L shape in the vertical and horizontal directions. In both cases, the amount of welding is reduced because they are joined by partial penetration welding in order to obtain the required strength, and the setup of the work is also easy. Therefore, the cost can be reduced.

Further, at the longitudinal ends of the members thus integrated, the partial penetration welds are sealed and completely sealed to prevent zinc from entering during hot dip galvanizing.

[0011]

EXAMPLES Next, the illustrated examples will be described.

FIG. 1 shows a welding method in one embodiment of the manufacturing method of the present invention. In this embodiment, two steel plates 2 and 3 formed by cutting the widthwise central portion of the steel plate at an angle of 45 degrees are butted against each other in an L shape as shown in FIG. The large angle material 1 is manufactured by partial melt welding and integration by multi-layer welding such as MIG welding, CO ₂ welding, or submerged arc welding. FIG. 1 (b) shows the details of the partial penetration welds 4 and 5, and the portions indicated by broken lines in the drawing are grooves 4a and 5a for welding.

The partial penetration welds 4 and 5 are continuous in the longitudinal direction of the member, and their depths d ₁ 'and d ₂ ' are determined by the width T'of the abutting surfaces (= 2 ^1/2 T: T is the steel plate 2, 3). (1/4) T ′ or more, and the portions between the partial penetration welds 4 and 5 are left unwelded. By setting the depths d ₁ ′ and d ₂ ′ to (1/4) T ′ or more, the strength required for the large-sized angle member 1 at the joint is secured. In the figure, d
₃ 'corresponds to the width of the non-welded portion, in this case, (1/2) T'
It becomes the following.

The large angle material 1 according to the present invention is hot-dip galvanized, and the end portions in the longitudinal direction of the member are completely welded by seal welding between the partial penetration welded portions 4 and 5. Prevent zinc from penetrating into the large angle member 1 to cause cracking. FIG. 2 shows the appearance of the large-sized angle member 1 manufactured by the method of FIG. 1, and in the drawing, 6 is a seal weld portion at the end in the longitudinal direction.

FIG. 3 shows a welding method in another embodiment of the manufacturing method of the present invention. In this embodiment, FIG.
As shown in (a), the end portions of the two steel plates 12 and 13 are butted in an L shape in the vertical and horizontal directions (at the upper end portion of the horizontally oriented steel plate 13,
(One side of the steel plate 12 is longitudinally butted) and the butted part is integrated by partial penetration welding by multi-layer welding such as MAG welding, MIG welding, CO ₂ welding, or submerged arc welding to produce a large angle material 11. To do.
FIG. 3 (b) shows the details of the partial penetration welded portions 14 and 15. The portion indicated by the broken line in the drawing is a groove 1 for welding.
4a and 15a.

The partial penetration welds 14 and 15 are continuous in the longitudinal direction of the member, and their depths d ₁ and d ₂ are respectively (1 / the width of the abutting surface) (corresponding to the thickness of the steel plate 12).
4) T or more, and the portion between the partial penetration welds 14 and 15 is left unwelded. Depths d ₁ and d ₂ are (1/4) T
With the above, the large angle member 11 at the joint portion
The required strength is secured. In the figure, d ₃ corresponds to the width of the non-welded portion, and in this case, it is (1/2) T or less.

At the end of the large angle member 11 in the member longitudinal direction, the partial penetration welded portions 14 and 15 are completely welded by seal welding, as in the case of FIG.

[0018]

EFFECTS OF THE INVENTION In a range sufficient to secure the strength as an angle material, partial penetration welding is performed instead of complete penetration welding, so the welding amount is small, work setup is simple, and cost is reduced. The manufacturing process can be shortened.

Since a large-sized L-shaped angle material is manufactured by processing a steel plate and welding, a significant cost reduction can be achieved as compared with a case where a rolling roll is manufactured as a custom-made product.

Since the amount of welding is small, defects, deformation, etc. due to welding strain and the like are less likely to occur. By sealing and welding the ends of the member in the longitudinal direction, it is possible to prevent zinc from penetrating into the member during hot dip galvanizing.

[Brief description of drawings]

FIG. 1A is a sectional view showing a welding method for manufacturing a large-sized angle member according to an embodiment of the present invention, and FIG. 1B is an enlarged view of a main part thereof.

FIG. 2 is a perspective view showing an appearance of a large-sized angle member manufactured by the method of FIG.

FIG. 3 (a) is a sectional view showing a welding method for manufacturing a large-sized angle member in another embodiment of the present invention, and FIG. 3 (b) is an enlarged view of a main part thereof.

FIG. 4 is a cross-sectional view showing an example of a conventional method for manufacturing a large-sized angle member.

FIG. 5 is a cross-sectional view showing another example of a conventional method for manufacturing a large-sized angle member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Large angle material, 2, 3 ... Steel plate, 4, 5 ... Partial penetration welding part, 4a, 5a ... Groove, 6 ... Seal welding part, 1
1 ... Large angle material, 12,13 ... Steel plate, 14,15 ...
Partial penetration welds, 14a, 15a ... Grooves

Claims (2)

[Claims] 1. A method for manufacturing a large-sized angled material, which comprises integrating two steel plates each having an inclined surface formed on one side thereof at an angle of approximately 45 degrees by abutting them in an L shape at the inclined surface, Along both ends with a groove having a predetermined depth continuous in the longitudinal direction of the member, and the groove portions are partially melted and welded to integrate the two steel plates, and at the same time, the end portions in the member longitudinal direction are welded partially. A method for producing a large-sized angle material for hot dip galvanizing, characterized in that parts are completely closed by seal welding. 2. A method for manufacturing a large-sized angle member in which the end portions of two steel plates are vertically and horizontally butted in an L shape to be integrated with each other. A groove having a predetermined depth continuous in the longitudinal direction of the member is provided, and the groove portion is partially melted and welded to integrate the two steel plates, and seal welding is performed between the partially welded welded portions at the longitudinal end of the member. A method for manufacturing a large angle material for hot dip galvanizing, which is characterized in that it is completely closed.