JPH06238438A - Machining and welding of fillet joint - Google Patents

Abstract

PURPOSE:To provide the machining and welding method capable of eliminating the removal of paint remained on joint cut machining surface and executing the fillet welding having few defect of welding bead part and high quality, at the fillet welding of a mounting member having high grade joint cut surface. CONSTITUTION:A joint cut surface 3 of a mounting member 3 to butt an plate edge to T or L shape is cut with forming a small projecting part 4 of a height of 0.5-1mm in an appropriate interval, the joint cut surface 3 of this mounting member 2 is fillet welded with having tack welded to T or L shape on a face material 1 through the clearance formed by the small projecting part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a fillet joint.

[0002]

2. Description of the Related Art FIG. 3 is a perspective view of a bridge girder or box girder of a bridge, in which a mounting member 2 such as a stiffener is mounted on a face member 1 in a T-shape or L-shape by butt-filling welding and manufactured in a factory This is an example of a structural block of a small unit, and the processing of the joint cutting surface 3 to be welded of the mounting member 2 attached by the fillet joint in this way has been advanced in recent years by cutting technology using an NC laser cutting machine or the like. As a result, the precision of cutting has become significantly higher, especially for those processed by a laser cutting machine.
The smoothness of the material is so high that the coating material coated on the steel sheet is left as it is until the end of the cutting line and is being cut. However, these paints remaining on the joint cutting processed surface 3 are generally burned and removed by a gas flame or the like, but it is difficult to automate because each cutting member is individually removed, which requires a long working time. become. On the other hand, when fillet welding is performed on the joint cutting surface 3 without removing such residual paint, the gas and steam generated by the burning of the paint during welding cannot be completely exhausted, and a large number of blow holes and pits are formed in the weld bead. There is a problem that such a defect portion is generated and a large number of man-hours are required to repair it.

[0003]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances, and remains on the joint cut work surface during the fillet joint welding of the attachment member having the high quality joint cut work surface. An object of the present invention is to provide a work welding method for a fillet joint that enables high-quality fillet welding with few defects in the weld bead while omitting the removal of paint.

[0004]

To this end, the present invention provides a T
Corners of the above-mentioned members are machined by forming small protrusions with a height of 0.5 mm to 1 mm at appropriate intervals on the fillet joints of the members that butt the ends of the plates into L-shape or L-shape. It is characterized in that the meat-joint portion is temporarily attached to another member in a T-shape or an L-shape with a gap formed by the small projection portion being present, and the fillet main welding is performed.

[0005]

In the work-welding method for a fillet joint of the present invention, when the mounting member is temporarily attached to the face material of the fillet joint, a small projection height gap on the mounting member side is maintained along the contact surface between the two members. If fillet welding is performed from both sides at the same time or one side in this state, gas and steam generated by combustion of the coating film at the welding line portion at the time of welding evaporate through the gap, and no longer remain as pores in the welding bead. It has the function of preventing the occurrence of welding defects such as blow holes and pits.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for welding a fillet joint according to the present invention will be described with reference to the drawings. FIG. 1 shows an outline of the method, FIG. 1 (I) is a perspective view of a mounting member, and FIG. FIG. 2 is a side view of a fillet joint between a face material and a mounting member, and FIG. 2 is a plan view showing another processing example of the mounting member.

In FIG. 1, reference numeral 1 is a face member constituting a fillet joint, 2 is a mounting member which is mounted on the face member 1 in a T-shape or L-shape, and 3 is 500 mm to 100 mm on the joining line side of the mounting member 2.
The joint cutting surface is formed by forming circular small protrusions 4 having an overhanging height of about 0.5 mm to 1 mm at intervals of about 0 mm and cutting with a NC laser cutting machine or the like. Mounting member 2
Is cut out from a material steel plate by an NC laser cutting machine, and the cut-out mounting member 2 is temporarily attached to the face material 1 at the end on the joint cutting surface 3 side. Reference numeral 5 denotes a gap formed by the height of the small protrusion 4 between the face material 1 and the joint cutting surface 3 of the mounting member 2.

Under this condition, when the face material 1 and the mounting member 2 are subjected to main fillet welding on both sides simultaneously or on one side, gas and gas generated by combustion of the coating film adhering to the face material 1 and the mounting member 2 at the welding point Water vapor, etc. evaporates through the gaps to promote evaporation, and as a result, blowholes, pits, etc. in the weld bead are eliminated even if the step of removing the paint remaining on the joint cutting surface 3 is omitted. The effect of significantly reducing the number of defective portions is obtained. According to experiments, the occurrence of defects in blowholes and pits in the weld bead by this method is N
Compared to the case where fillet welding is performed without removing the residual paint by providing a smooth cutting process with a C laser cutting machine, the occurrence rate is 1/10 or less. In addition, even if this is cut by another cutting machine such as a gas cutting machine and the paint near the weld is burned off with a gas flame and normal fillet welding is performed, the incidence rate is 1/2 or less. Therefore, in the fillet welding of a member having a high contact surface precision at the fillet joint weld line portion, high quality welding can be achieved without removing the residual adhered paint.

Next, in FIGS. 2A and 2B, the small protrusion 4 of the joint cutting surface 3 of the mounting member 2 is replaced by the triangular small protrusion 4.
a, another embodiment formed on the rectangular small protrusion 4b is shown.
The small protrusion 4 may be provided in any shape other than the above. 2 (C), (D), and (E) show the mounting member 2
At the time of cutting the
a, a method of cutting the rectangular small protrusions 4b and the circular small protrusions 4 into two pieces respectively. According to this method, the joint cutting surface 3 of two members of the same size is NC.
There is an effect that it can be cut in one pass by a laser cutting machine and an increase in cutting processing time can be suppressed.

[0010]

In summary, according to the present invention, small protrusions having a height of about 0.5 mm to 1 mm are formed at appropriate intervals at the fillet joints of members on the side where the ends of the plates are abutted in a T shape or an L shape. Then, the fillet joint part of the above-mentioned member is temporarily attached to another member in a T-shape or L-shape with a gap formed by the small projection portion, and the fillet main-welding is performed. Due to this, when welding the fillet joint of a mounting member having a high-grade joint cutting surface,
The present invention is extremely useful industrially because a method of welding a fillet joint that enables high-quality fillet welding with few defects in the weld bead portion is obtained by omitting the removal of paint remaining on the joint cutting surface. Is.

[Brief description of drawings]

FIG. 1 shows an embodiment of a method for welding a fillet joint of the present invention. FIG. 1 (I) is a perspective view of a mounting member, and FIG. 1 (II) is a side view of a face material and a fillet joint of the mounting member. is there.

FIG. 2 is a plan view showing another example of processing the mounting member.

FIG. 3 is a perspective view of a known structural block manufactured by fillet welding of a face material and a mounting member.

[Explanation of symbols]

 1 Face material 2 Mounting member 3 Joint cutting surface 4, 4a, 4b Small protrusion 5 Clearance

Claims (1)

[Claims] 1. A T-shaped or L-shaped member on the side where the ends of the plates are butted together is cut and processed by forming small protrusions having a height of about 0.5 mm to 1 mm at appropriate intervals, and The fillet joint is characterized in that the machined fillet joint of the member is temporarily attached to another member in a T-shape or L-shape with a gap formed by the small protrusion portion and the fillet main welding is performed. Processing welding method.