SU1349929A1 - Method of removing defects of weld - Google Patents

Abstract

The invention relates to the technology of electron beam repair welding and can be used in various areas of mechanical engineering. The aim of the invention is to improve the quality of the welded joint and the performance of the process. At the defective part of the junction of parts 1 and 2, a conical opening is made into which an insert Z0 is installed. An electron beam (l) 4 that scans at the initial time with an amplitude equal to the diameter of the part of the insert 3 that protrudes above the surface to be welded increases the current L from zero to the operating value and at the same time reducing the amplitude of scanning L in a spiral. In this case, the protruding part of the insert is melted down and its thickness is welded. The completion of the welding cycle can be accomplished by the inverse interaction of the current and the scanning amplitude L or only by decreasing the current L 2 or (L

Description

113

The invention relates to the technology of electron beam repair welding and can be used in various fields of mechanical engineering.

The purpose of the invention is to improve the quality of the welded joint and the performance of the process.

Fig. 1 shows a schematic diagram of the welding of a defective seam section with an insert in the cross section of the joint; fig 2 is the same, top view

At the defective part of the junction of parts 1 and 2, a conical opening is made into which insert 3 is installed. The electron beam 4, which at the initial time is scanned with an ampoule equal to the diameter of the part of the insert 3 that protrudes above the surface of the product being welded, increases - and the beam current from zero to the operating value and at the same time reducing the amplitude of the beam scanning in a spiral. In this case, the protruding part of the insert is melted and welded to the full thickness. The welding cycle can be completed by the inverse interaction of the current and the amplitude of the beam scanning or only by reducing the beam current.

A welded joint is obtained in one welding cycle with filling the upper part of the crater with the molten metal. The melted metal is intensively mixed by the scanning beam, which contributes to the active degassing of the liquid metal, and the coordinated interaction of the beam current with the scanning amplitude eliminates non-fusion, especially in the case of significant transverse dimensions of the insert. This leads to a decrease in the quality of the welded joint,

Example, Electron-beam welding of AMGB aluminum alloy plates with a crowd of 20 mm is performed in the 27 KBi Ice 210 mA mode; -) pc, „. 73 mA; Vjg 30 m / h in the lower position. The distance from the electron beam gun to the surface of the welded P.IaIT 170 mmo

To simulate the appearance of crater-like defects, periodic

H

Turning off the power source, Houijie depressurizing the chamber in the defective section makes a hole of a conical shape and the diameter of the upper part of the tapered hole exceeds the width of the weld. Then, an AMGB alloy insert is inserted into the hole with dimensions corresponding to the conical

hole, protruding above the surface of the plate area with a height of 3 mm. After obtaining a working vacuum, the insert is welded into the hole in the mode: U ,, 27 kV; P.

72 + 1 mA, the beam current -I varies from O to 180 + 5 mA and back with a geometric axis of an electron beam gun stationary relative to the product being welded. The beam is scanned in a circle with a varying diameter from 10 mm to PC,

There is no pore and non-fusion in the weld metal.

. The proposed method for elimination of weld defects in comparison with the known one allows to increase the productivity of the process by a factor of about two and the quality of the joint is higher.

by reducing porosity and eliminating non-fusion,

F- formula and 3 gain

A method for elimination of defects in a weld type of a crater by electron beam welding, in which a tapered bore is made in the defective area, is inserted into it by an insert protruding above the workpiece. the protruding part of the insert is melted with a surface, and then it is welded to the full thickness, which is different, so that, in order to improve the quality of the welded joint and the process performance, the insert is melted and welded with a scanning electron beam in a single welding cycle. with a smooth decrease of 50

by sweeping the diameter of the sweep from the diameter of the protruding part of the insert to zero and increasing the beam current from zero to the operating value.

trajectory scan- / Srobani

Editor I.Gorn

Compiled by G. Kvartalnova Tehred L. Oliynyk

Order 5217/12 Circulation 970 Subscription

VNVDSh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, ul, Proektna, 4

FIG. 2

Proofreader M. Demchik

Claims (1)

Claim A method for eliminating defects in a weld of a crater type by electron beam welding, in which a conical hole is made in the defective section, an insert θ protruding above the workpiece is installed in it. surface, melt the protruding part of the insert, and then weld it to the entire thickness, characterized in that · in order to improve the quality of the welded joint and process performance, the insert is melted and welded in one welding cycle by a scanning electron beam around the circumference with a smooth decrease in _{| 0 the} diameter of the scan from the diameter of the protruding part of the insert to zero and an increase in the beam current from zero to the operating value. I 349929 FIG. 2