Special features of forming thick‐walled welded joints in brazing and fusion welding

The results of comparison of brazed scarf joints of different design on the basis of the distribution of working stresses are presented. The design of the tooth-type brazed joint is proposed and the joints are evaluated by the finite element calculations which show only a slight stress concentration in the joints of this type.     

Special features of preparation and application of ultra‐thin tungsten electrodes

The process of the formation of welding aerosol (WA) and the factors affecting its quantitative composition are investigated. The experimental results show that the amount of the main components of the WA in manual coated electrode arc welding increases without exceeding the maximum permissible concentration.     

Special features of manufacture of ring‐shaped transition pieces from explosion‐welded,steel‐aluminium blanks

Coating deposition modes and techniques on the surface by manual arc under conditions of process pulsed variation of power data on the surface of parent metal and welded joints from the austenitic steels are developed.     

Special features of welding high‐strength,high‐alloy steel with mixed carbide‐intermetallic hardening

A method of pulsed-arc welding with preheating of the electrode in the break between pulses is discussed. The effect of the distance between the contact tips on the melting factor is determined.     

Numerical simulation of current distribution in metal pad of aluminum reduction cells

Based on the numerical calculation of 3-D potential distribution in aluminum reduction cells, current distribution in the metal pad is calculated under the following conditions： 1） pot ledge ideally formed; 2） ledge extension to below anode; 3） different metal heights; 4） AC and 5） Spike. It is found that Jy in metal pad increases first to a highest point and then decreases along anode length. At normal status, the largest Jy is about 0.4 A/cm^2 and it locates at about 2/3 of anode length. With longer ledge, the maximum value of Jy decreases and its position moves center-ward. The longer the side ledge, the larger the negative current flowing center-ward at side channel. Jy in metal pad increases with anode length and it is not affected by metal height; while Jy increases with metal height. At AC, current flows toward metal under new anode. At spike, current concentrates at spike rather than evenly distributes. Normally, Jy is almost negligible in metal pad.     

Special features of controlled heat and mass transfer in consumable electrode welding with short‐circuiting of the arc gap

Investigations were carried out into the physical-chemical processes taking place at the piezoceramics-metal interface, the effect of the diffusion bonding parameters on formation of the transition zone and the mechanical strength of the joints under static tensile loading. The piezoelectric characteristics of piezoceramic transducers are also studied.     

Expanding the range of application of the plasma‐powder process in welding and surfacing

The creep-resisting VT38 sheet titanium alloy is described. The mechanical properties of the alloy at high temperatures are higher than those of the VT20, VT18U alloys and alloys of the VT80U type with additional alloying.     

X‐ray diffraction examination of coatings,produced by electric arc surfacing of a titanium carbide‐based composite powder

This paper discusses the relationship between the concentration of oxygen in the weld metal deposit – produced with basic- and rutile-shielded electrodes – and the size of non-metallic inclusions. Furthermore, this paper presents a mathematical formula that allows one to calculate the diameter of non-metallic inclusion in the metal weld deposit depending on the concentration of oxygen in MWD.     

Special features of the α → γ transformation in powder carbon steels

The structural state of powder steels after sintering depends on the technological regimes of their production and can markedly affect the transformations in subsequent heat treatment. The effect of the technological regimes on the nature of the transformation is investigated.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 14–16, March, 1996.     

Evaluation of high‐temperature ductility in weld metal. Study of reheat cracking in metal active‐gas welding with flux‐cored wire stainless steel weld metal (2nd Report)

The special features of the weldability of high-strength low-carbon microalloyed steels are investigated.     

Special features of the distribution of interstitial elements in cast and deformed titanium pseudo-α-alloy

Conclusions  

Growth features of crystals in laser‐welded aluminium and aluminium alloys

In the present work, the increase in the basicity index of the slag system of the flux, represented by the ternary system of MnO–SiO₂–CaO oxides, is evaluated. The increment of the basicity index is performed by the addition of CaO, keeping the MnO/SiO₂ percentage relation of the system constant, in order to evaluate the behaviour of the chemical composition resulting from the metal deposited by SAW. As a result, it is possible to intensify the Mn transfer to the deposited metal and at the same time attenuate that of the Si, S, P and the carbon remains basically unalterable. All this makes it possible, in combination with low-manganese wire, to obtain similar results to those obtained with fluxes of lower basicity in combination with medium manganese wires.