SU978996A1 - Method of forged and welded articles - Google Patents

Description

(54) METHOD FOR GETTING WOOD-WELDED PRODUCTS

The invention relates to the processing of metals by pressure, in particular to methods for producing forged-welded products, and can be used in heavy and energetic construction.

A known method for producing wrought-iron products includes forging individual elements of a stepped shape, welding them together and finally forging the welded block 1.

The disadvantage of this method is the low quality of the products obtained.

The purpose of the present invention is to improve the quality of the products obtained by ensuring that the properties of the metal in the welding zone are homogeneous.

To this end, when producing forged-welded products by a method that includes forging individual elements of a stepped form, welding them together and final forging the welded block, forging individual elements on their lateral surface from the side of the welded end, an annular joint is formed with the ratios b / And 0.05 ... 0.15 and, 03 .. .0.15, where is the height of the ledge, H is the size of the step of maximum diameter, P is the length of the step, and

The forging of the welded block begins with the alternate deformation of the steps.

Due to the fact that after welding the plastic properties of the metal of the superheated heat-affected zone and the weld metal are 40-70% lower than the similar characteristics of the base metal, to achieve the same properties of the joint after forging, it is necessary to deform the weld zone 10 with relative crimping E (e) where lb - absolute compression) - 10-30% less than the heat-affected zone. This difference in the reduction of the seam and the heat-affected zone provides: em implementation of the ledge with the parameters -

15

0.05. . .0.15.

The lowest mechanical properties of the superheated heat-affected zone are observed at a distance of (O, 05... O, 20) H

20 from the plane of symmetry of the seam. In this connection, it is necessary to perform a step with a relative length of 0.03 ... 0.15. Alternately, forging steps beyond the welded joint provides for the development of the joint zone throughout the volume under the scheme of the stressed state of the axial compression, which contributes to the welding of welding defects and intensive development of the superheated

Claims (1)

30 heat-affected zone and cast structure leads to uniformity of properties of the weld, superheated heat-affected zone and the metal of the workpiece. Thus, an improvement in the quality of the product is achieved by obtaining uniform metal properties in the bulk of the product. Fig. 1 shows the forging of steps (of a shaft; Fig. 2 — a blank for welding; FIG. 3 — a ball of metal grain along the length of a weld (1-metal of the workpiece; 2 — a heat-affected zone; 3 — a weld). An example of a specific implementation of the method is the implementation of a stepped shaft with a length of 12000 mm with a barrel diameter of 2500 m and a barrel length of 5500 mm. According to this method, first two steps are made, having final dimensions of forging, and rectangular steps with a shoulder to be welded and forged with maximum times With a 3000 mm section step and a ledge with a height of 200 mm and a length of 200 mm. Then, the workpieces are welded together to forge the welded block, first deforming step by step, and then the steps with the seam. Using this method for forging large forged welded articles, mainly shafts provides, compared to the base object, which is taken as a prototype, high quality polished jX products. Claims for the production of forged-welded products, including forging individual elements of a stepped shape, their welding Between itself and the final forging of a welded block, characterized in that, in order to improve the quality of the products obtained, by ensuring the possibility of obtaining homogeneity of the properties of the metal in the welding zone, forging individual elements on their lateral surface, an annular ledge is formed from the side of the welded end ti / H 0.05 ... 0.15 and, 03. . .0.15, where 11 is the height of the step, H is the size of the step of maximum diameter, 2 is the length of the step, and the forging of the welded block begins with alternating deformation of the steps. Sources of information taken into account in the examination 1. USSR author's certificate in application 2563776/27, cl. B 21 J 1/04, 1978 (prototype).