SU899309A1 - Shells welding method - Google Patents

Description

The invention relates to the field of welding, iiB in particular, to a method of welding shells can be used for fusion welding of shells of large diameter e sheet blanks in a chemical, automatized other machine-building industry.

The closest but technical essence to the present invention is the composition of the pile {of the shells, in which the shell is collected from at least two; One hundred and half procurements and perform longitudinal seams. The joints are welded sequentially, after another GPO. The main disadvantage of the known method is the long duration of the transasse due to the welded joints.

In addition, a disadvantage is also a significant deformation of the shell under the action of welded stresses, which is also caused by the alternate welding of the joints.

The purpose of the invention is to reduce the residual welding deformations of the resulting shell and increase the welding productivity.

1The supplied spruce is achieved hundreds of ways to pile {shells, mainly of diameter and small extent, 1 of which the sheath is assembled, at least, from two sheet blanks and out-; welding of longitudinal joints, dough blanks are assembled with variables from O to (0.1-0.2) 0, where O is the thickness of this; billets, along the length of the 3a3opavni junction and change the direction of the gap divergence to the opposite and each subsequent. the joint, and welding all the joints at the same time, starting it at each joint from the side.

FIG. 1 shows a welded shell; in fig. 2 is the same, top view in FIG. one; in fig. 3 - the same water on the side of the fng. one.

The method is implemented as follows.

Claims (1)

Sheet blanks are collected in the conductor so that there is a gap (0,1-O, 2) of thickness L1k from one storotl between the edges; The gap Bemnma in the specified range is determined by the maximum allowable gap to prevent the weld pool from breaking by the surface tension forces when welding without an additive. The edges of the blanks are fixed in an adaptation of a known structure to prevent the gap width from changing during the welding process under the action of welding stresses. At each successive joint, the direction of the divergence of the edges is reversed, this allows reducing welding deformations and partially compensating for their influence by simultaneously welding all the joints in opposite directions. Welding is performed non-melting with a tungsten electrode in an inert environment; foot gas. The presence of a variable gap allows to reduce the residual welding stresses in the seam. Welding from the side of a large gap allows, without increasing residual stresses and deformations, divergence of the edges of the joint during the welding process. The deformation of the shell during the alignment process is mutually compensated by simultaneously welding all joints in opposite directions. Example. Welding of shells with a diameter of 1100 mm. The shell is assembled in a conductor of six 1 mm thick molybdenum sheet blanks. The edges of the blanks on the one hand set with a gap of 0.15 mm. The direction of divergence of the edges at each subsequent junction is reversed. Welding is performed in a chamber in a controlled atmosphere with gels with non-melting tungsten electrode of all seams at the same time. The welding conditions are 117A, U and 15B, VCB 14 m / h. The maximum dielectric strength of the shell is 0.8 mm. Thus, by simultaneously welding all the joints and setting the edges of the blanks with the specified gap, labor productivity is increased by speeding up the welding process and the deformation of the shells is reduced. The method of the invention is welding (and shells, mainly of large diameter and small length, in which the sheath is collected, at least from two sheet blanks, and longitudinal welding is performed, characterized in that, in order to reduce the residual welding deformations of the obtained sheath and increase the productivity of the welding process, sheet blanks are assembled; they are variable from 0 to (0.1-0.2), where eG is the thickness of the sheet billet, gaps along the joint length and change the direction of the gap divergence to the opposite by Each subsequent joint, and welding all the joints at the same time, starting it at each joint from a larger gap. Sources of information taken into account during the examination I. USSR author's certificate N 435085, class B 23 K 37/04 ,. 1967 (prototype). Phi1.1 Fe / eZ