Evaluating the design and technological strength of a press stand using SVARKA software

• Published in: Welding international Vol. 17; no. 6; pp. 473 - 475
• Main Authors: Makarov, E L, Kurkin, A S, Batov, G P, Rozanov, D S
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 01.06.2003
• ISSN: 0950-7116; 1754-2138
• DOI: 10.1533/wint.2003.3152

When welding elements of press stands at the Voronezh plant of heavy mechanical presses (HMP) there were cases of formation of cracks in welded joints during welding and heat treatment of structures. To develop welding technology, excluding the formation of these defects, it is necessary to analyse the reasons for their formation. The area of cracking (in the HAZ) makes it possible to classify cold processing cracks. The factors causing the formation of this crack include the formation of variable quenching structures of the material, saturation of metals in welding with diffusion hydrogen, a higher level of temporary and residual welding stresses. Special features of the structure (large thickness of the cross-section and thickness of the components, application of medium-carbon steels) do not make it possible to propose any simple solution to this problem. It is necessary to develop a method of regulating the order of sequence and welding conditions and heat treatment which would reduce the high values of unfavourable factors and also prevent the simultaneous appearance of several harmful factors (structure, hydrogen concentration, stress concentration) in one of the zones of the welded joint. To develop a rational technology without carrying out expensive technological experiments, investigations were carried out using SVARKA software developed at the department of welding of the N E Bauman State Technical University. [Materials: 35L, St3 steels.]