JPH1147985A - Welding tool for setting flange at right angle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exactly execute tack welding on the whole circumference in one operation with a supporting holder positioned to a pipe at a right angle and with a flange to be welded closely attached to the supporting holder by arranging a square bar which has suitable thickness and length for insertion to the inside of the pipe and has mutual equal distanced parallel edge lines standing on each of the sides consisting of edge of surfaces so that the three surfaces of a surface and the two opposed surfaces are positioned at right angle on the supporting holder. SOLUTION: A welding flange 5 is put on a pipe 6 to be welded, a tool suitable for the size of the pipe is inserted inside the pipe, and then a push screw 4 is set in a suitable position. The distanced parallel edge lines of the square bar 1 come to a state that the inside of pipe is spanned with a bridge, and when the push screw 4 is tightened a knocking piece 3 knocks the inside wall of the pipe, and then positions are fixed at three contact points of the two parallel edge lines and the knocking piece 3. In consequence, the position of the supporting holder 2 is fixed at a right angle. The flange is closely attached to the supporting holder 2 and the tack welding is executed on the whole circumference in one operation. Further, modifications are practical as well that the knocking piece 3 is replaced with a cam, the tap screw 4 is replaced with a structure to push the knocking piece 3 with a lever, the square bar 1 is replaced with a round bar whose outer diameter is machined on three surfaces instead.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange right angle welding tool capable of temporarily welding a flange to a pipe at a right angle in a pipe of a plant facility or the like. 2. Description of the Related Art When welding a flange to a pipe It is required to weld a pipe at a right angle except for special cases. For this purpose, he works while performing temporary welding using a right angle ruler for flanges to check and correct the right angle.
However, the same operation is repeated many times to check the right angle and weld, which is very troublesome and inefficient. [0003] [Problems to be Solved by the Invention] In the present invention, except for such a drawback, when mounted on the basis of the inner diameter of the pipe, the contact plate 2 is positioned at right angles to the pipe, and the welding flange is closely attached to the plate to perform one operation. Thus, the inventors invented a device capable of accurately performing temporary welding all over the circumference and easily attaching and detaching the device. [Means for Solving the Problems] Now, the structure will be described. (A) A square steel 1 having an appropriate width and length to enter the pipe and having the same parallel angle width as one side of the plane is applied. The plate 2 is provided with three surfaces, that is, a flat surface and a width surface, at right angles. (B) A square metal 1 is provided with an abutment 3 at a central portion on the opposite side of the flat surface, and is protruded when a set screw 4 is tightened. [Operation] Next, the operation of the present invention will be described. To use the present invention, a flange is inserted into a pipe to be welded, an instrument having a size corresponding to the pipe is inserted into an inner pipe of the pipe, and a set screw 4 is tightened at an appropriate position. When the width parallel angle of the square steel 1 is bridged to the inner pipe and the set screw 4 is tightened, the abutment 3 pierces the inner pipe wall and is stopped at three contact points of the parallel line and the abutment 3. Therefore, the abutment plate 2 is stopped at a right angle. Temporary welding can be performed on the entire circumference in one operation by bringing the flange into close contact with the backing plate 2. Embodiments In carrying out the present invention, the following can be performed. (A) The abutment 3 may be a cam. (B) Instead of the set screw 4, the lever 3 may be pressed with a lever. (C) Flat steel can be used instead of the square steel 1. (D) Three sides of the outer diameter of the round steel can be cut and replaced with the square steel 1. [Effect of the Invention] The attachment / detachment of the device of the present invention can be accomplished by simply loosening the push screw 3 by hand, and the flange can be worked all around at right angles to the pipe in a single step and the efficiency is good.

[Brief description of the drawings] FIG. 1 is a front view of the present invention. FIG. 2 is a sectional side view of the present invention. FIG. 3 is a partial cross-sectional front view mounted on a pipe. FIG. 4 is a partial cross-sectional side view mounted on a pipe. [Explanation of symbols] 1 Square steel 2 Patch 3 Reserve 4 Push screw 5 Weld flange 6 pipes

Claims (1)

Claims 1. A square steel 1 having an appropriate width and length and a parallel angle equal in width to one side of a plane is provided on a backing plate 2 and three planes, a plane and a width, are provided at right angles. Abutment 3 is a push screw 4 in the center of the side
Flange right angle welding equipment with a structure that projects when tightened