JPS5829587A - Electron beam welding method for long and hollow round bar - Google Patents

Abstract

PURPOSE:To make the manufacture of a long-sized pipe having stable quality possible by evacuating air from one end of two hollow round bars to be butt- welded with a vacuum pump, blinding the other end, containing the narrow range including the butt parts in a vacuum chamber and welding said parts while rotating the round bars synchronously. CONSTITUTION:One end of two hollow pipes 1, 2 to be butt-welded is connected through an adapter 6 having a rotating seal to a vacuum pump, by which air is evacuated therethrough. The other end 5 is held blinded. The extremely limited range including the butt parts is contained in a welding chamber 3 via packings 4, 4' for vacuum sealing. The pipes 1, 2 are rotated synchronously with rotating mechanisms 7, 7' and while the inside of the chamber 3 is evacuated to a vacuum with an another evacuating device, the joint parts are welded by an electron beam.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electron beam welding method for a long hollow round bar.

The object to be welded using an electron beam welder has the disadvantage that the shape and size of the object is limited because the welding chamber is in a vacuum.
For extremely long objects, an external vacuum electron beam welding machine is used. However, it goes without saying that welding in a vacuum is superior in terms of welding quality.

An object of the present invention is to provide an electron beam welding method that enables workpieces to be welded in a vacuum, which has conventionally been done outside a vacuum.

The present invention uses butt welding. One end of the two hollow round rods is evacuated with a vacuum pump, the other end is blinded, a rotating attachment is provided so that the hollow round rods can rotate in synchronization, and a very limited area including the abutment part is installed. The key is to place the rod in a vacuum chamber, electron beam weld the abutting portion, and create a long hollow round rod. To explain according to the drawings, in order to make a long hollow round bar 1 as shown in Fig. 1, one method is to connect the short pipes 2 one after another.In this case, the completed length is about 10 m at most. In some cases, processing is possible in a vacuum chamber, but the
If it is 00 m or more, it becomes very expensive in terms of cost and there is no merit. Furthermore, when performing vacuum welding, the welding surface may be oxidized, or electron beam irradiation for several Ioms without any discharge may be a problem, so the present invention is stable in vacuum as shown in Figure 2. Welding room 3
has been established.

In the welding chamber 3, there is a sealing material 4.4' for vacuum sealing the outer diameter of the vibrator, and while maintaining the vacuum,
The vibrator has been modified so that it can rotate or slide in the axial direction. One end 50 of the vibrator 1 is kept blank in advance, so that the atmosphere will not leak from there.Furthermore, one end of the vibrator 2 has an adapter 6 with a rotary seal, and the inside of the vibrator can be sealed through this adapter 4. It can be exhausted. Note that the welding chamber 3 is evacuated to a vacuum by another exhaust device. The vibrators 1 and 2 are rotated synchronously by a rotating mechanism 7.7', and are further subjected to axial preload to each other, and the joint portion is welded by an electron beam.

When welding is finished, vibrators 1 and 2 are shifted to the right,
Yet another vibrator is inserted from the left and welded in the same way. By repeating this process one after another, the total number of pipes is 10m to several 100? ? It is possible to create objects as long as I.

According to the present invention, since the inside of the pipe can be evacuated to a vacuum, the gas generated on the back side during penetration welding can also be treated, making it possible to manufacture long hollow vibrators with stable quality. .

[Brief explanation of the drawing]

FIG. 1 is a side view of a long object, and FIG. 2 is a diagram showing the entire method of electron beam welding of a long object according to the present invention. In the figure, 1.2 is a hollow pipe, 3 is a welding chamber, and 4.4
'' is a gasket for vacuum sealing, 5 is the blind tip of the vibrator, 6 is an adapter for exhausting the inside of the pipe, 7
．． 7' is a rotating mechanism, 8 is a pipe holder provided at a proper location as a roller, and 9 is an electron optical column that generates an electron beam.

Claims (1)

[Claims] One end of the two hollow round rods to be butt welded is evacuated with a vacuum pump, the other end is blinded, a rotating attachment is provided so that the hollow round rods can rotate in synchronization, and the butt part is also closed. A method for electron beam welding of a long hollow round bar, characterized in that a very limited area containing the bar is housed in a vacuum chamber, and the abutting portion is electron beam welded.