SU1551498A1

SU1551498A1 - Method of preventing end cracks in arc welding

Info

Publication number: SU1551498A1
Application number: SU884459605A
Authority: SU
Inventors: Валерий Вилинович КАЛЮЖНЫЙ
Original assignee: Ворошиловградский машиностроительный институт
Priority date: 1988-07-12
Filing date: 1988-07-12
Publication date: 1990-03-23

Abstract

Изобретение относитс к сварке, а именно к способам предотвращени концевых трещин при дуговой сварке, и может быть использовано в различных отрасл х машиностроени дл сварки листовых конструкций и продольных швов обечаек. Цель изобретени - предотвращение образовани трещин на концевом участке шва при завершении сварки. К торцам свариваемых деталей 4 пристыковывают заходную и выходную планки. Выходна планка состоит из центральной 1 и двух боковых 2 пластин, св занных между собой прихватками 3. Пластины 2 расположены под углом по отношению к центральной пластине 1 с образованием зазора 5 со стороны рабочего торца планки. Прихватки 3 расположены на рассто нии А от рабочего торца планки, равном длине сварочной ванны. Ширина Б центральной пластины 1 равна рассто нию между изотермами, температура которых соответствует снижению упругих свойств материала планки наполовину. Планка имеет переменную жесткость и вначале предотвращает резкое раскрытие стыка, а затем не преп тствует поперечной усадке шва. 7 ил.The invention relates to welding, in particular to methods for preventing end cracks in arc welding, and can be used in various fields of engineering for welding sheet structures and longitudinal welds of shells. The purpose of the invention is to prevent the formation of cracks at the end portion of the seam when welding is completed. To the ends of the welded parts 4 dock entry and exit strips. The exit plate consists of a central 1 and two side 2 plates connected to each other by tacks 3. The plates 2 are angled relative to the central plate 1 to form a gap 5 on the side of the working end of the plate. Tacks 3 are located at a distance A from the working end of the bar equal to the length of the weld pool. The width B of the central plate 1 is equal to the distance between the isotherms, the temperature of which corresponds to a decrease in the elastic properties of the material of the strip by half. The plank has variable stiffness and initially prevents a sharp opening of the joint, and then does not prevent lateral shrinkage of the seam. 7 il.

Description

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Claims

Claim.

A method of preventing end cracks during arc welding, in which the parts are assembled for welding, at the beginning to the end of the joint, an input and output strips are installed, each of which consists of a central and two side plates, the central plates are installed along the axis of the joint, the side plates are installed with a clearance of But both sides of the central one, grab them to the central plate and the parts to be welded and weld the joint, starting and ending the 5th process, respectively, so that in order to prevent the formation of cracks at the end section of the weld ”at the end of welding, the width of the central plate 10 of the output strip is set equal to the maximum width of the welding isotherm corresponding to the temperature at which the plate metal loses its elastic properties by half, the lateral plates of the output strip are positioned at an angle to the central plate, creating the maximum clearance from the side of the parts being welded, and each side plate 2Q is seized well to the central one tack located at a distance from the end of the parts to be welded, not enshem weld pool length.

FIG. 5

FIG. 7