JPS5934475B2 - Spherical shell welding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spherical shell welding method for welding two hemispherical spherical shells to form a spherical shell.

Recently, with the development of marine resources, there has been a need to make pressure-resistant spherical shells for deep-sea submersibles that can operate at depths exceeding 1000 meters.

The material of this spherical shell is NS (100 kilograms), 10
High-grade materials such as Ni-8Co steel (13 kg) are used, and the manufacturing procedure is as shown in Figure 1. First, two square thick steel plates (IA)) are cut into circular pieces ((B )), press and heat treat each to form a hemispherical shell (as shown in O), and then weld them together at the equatorial plane as shown in I to form a spherical shell.By the way, The equatorial welding of both hemispherical shells is performed by automatic TIG welding, and since TIG welding must be performed downward, both hemispherical shells are welded around a horizontal axis that passes through the poles while holding the equatorial plane on the vertical plane. However, conventionally, such a spherical shell equatorial joint was rotated downwardly.
I have not seen any examples of G-welding work being carried out. The present invention was made in view of the above circumstances, and an object of the present invention is to provide a spherical shell welding method for producing a spherical shell by downward TIG welding of the equatorial joint of both hemispherical shells. When making a spherical shell by welding the equatorial grooves, a flange parallel to the equatorial groove is fitted to each hemispherical shell, and the two hemispherical shells are placed between opposing rotating drums with flanges via the flanges. The rotary drum is inserted and fixed through a plurality of connecting bolts, and the equatorial groove is welded while the rotary drum is rotated on a turning roll.

An embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a longitudinal sectional view thereof.

In the above figure, 1 and 1 are hemispherical shells for forming a pressure-resistant spherical shell by welding the equatorial grooves to each other, and 2 is a hemispherical shell with multiple bolt holes welded in parallel to the equator of the hemispherical shell 1. The flanges 3, 3 are cylindrical rotating drums facing each other at appropriate intervals on the same axis, and the flange 2' has a number of connecting bolt holes bored at the opposite end thereof.
, 2' are protrudingly provided, and the protruding flanges 2, 2 of the hemispherical shells 1, 1 are sandwiched between the flanges 2', 2', and both hemispherical shells 1, 2' are connected by a large number of connecting bolts 6, 6... Assemble and position 1 on the ball shell.

4 and 4 are pivoted parallel to each other at appropriate intervals, and are rotated in the same direction by a motor (not shown).
A turning roller rotates the rotating drums 3, 3 mounted and supported around the same axis in the same direction at the same speed; 5 is a welding torch for downward welding the equatorial groove 7 of the hemispherical shells 1; 8;
is a back shield that is located below the welding torch 5 and shields the equatorial groove 7 from the inside, and is supported by the upper end of the horizontal T-shaped support member 9 that extends laterally through the opening 10 of the hemispherical shell 1. ing.

A roller 11 is provided protruding from the lower end of the horizontal T-shaped support member 9 and rolls along the equatorial groove of the inner periphery of the shell as the rotating drum 3 turns.

With such a device, first, the inner periphery of the flange 2 forms a perfect circle around the outer periphery of the hemispherical shell 1 near the equatorial groove, and can be fitted onto a surface that is correctly parallel to the equatorial plane.

Next, the hemispherical shells 1, 1 with the flanges 2 protruding in this way are attached to the flanges 2 of the flanged rotating drums 3, 3.
', 2' and assembled with the connecting bolt 6, the equatorial groove 7 of both hemispherical shells 1, 1 is correctly centered on the axis X-X of the rotating drums 3, 3, Since it is located on a vertical plane that is correctly perpendicular to -X, as the rotating drums 3, 3 turn, the equatorial groove 7 moves directly under the welding torch 5 without swinging at all. At this time, the back shield 8 is always positioned opposite the welding torch 5 at the equator despite the rotation of the shell due to the horizontal T-shaped support member in which the roller 11 at the lower end rolls along the inner circumference of the shell. The lower surface of the groove 7 can be shielded.

When welding of the ball shell is thus completed, the flange 2 is removed.

Incidentally, in order to rotate the hemispherical shell vertically, it is possible to grasp and rotate the hemispherical shell itself, but it is quite difficult and there is a high possibility that the core will swing out.
If the above-mentioned device is used to fix both hemispherical shells to a cylindrical rotating drum via flanges, rotation without center runout can be obtained by using turning rollers, which allows for the equatorial bevel to be fixed. Uniform TIG welding along the length can be easily performed in a relatively short time.

In short, according to the present invention, when making a spherical shell by welding the equatorial grooves of two hemispherical shells, a flange parallel to the equatorial grooves is fitted to each hemispherical shell, and the flange is inserted through the flanges. By inserting and fixing the hemispherical shells between opposing rotating drums with flanges via a plurality of connecting bolts, and welding the equatorial groove while rotating the rotating drums on turning rolls, it is possible to prevent core runout. The present invention is industrially extremely useful because it provides a ball shell welding method that uniformly welds the equatorial grooves of both hemispherical shells without causing any damage.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing a known procedure for making a ball shell from a steel plate;
FIG. 2 is a cross-sectional view showing an example of an apparatus for carrying out the method of the present invention. 1, 1... Hemispherical shell, 2, 2... Flange, 2', 2/-... Flange, 3, 3...
... Rotating drum, 4 ... Turning roller, 5
...Welding torch, 6...Connection bolt,
7... Equatorial groove, 8... Back shield, 9... Support member, 10... Opening,
11... Robe.

Claims (1)

[Claims] 1. When making a spherical shell by welding the equatorial grooves of two hemispherical shells, a flange parallel to the equatorial groove is fitted to each hemispherical shell, and both hemispherical shells are opposed to each other via the flanges. A spherical shell welding method characterized in that the equatorial groove is welded while the rotating drum is inserted and fixed between flanged rotating drums via a plurality of connecting bolts, and the rotating drum is rotated on a turning roll.