Physical processes involved in strip electrode welding using the method of slatted splicing
- PDF / 342,426 Bytes
- 7 Pages / 612 x 792 pts (letter) Page_size
- 47 Downloads / 163 Views
MA TECHNOLOGY
Physical Processes Involved in Strip Electrode Welding Using the Method of Slatted Splicing V. O. Bushma Moscow State Technological University “Stankin,” Vadkovskiі per. 1, Moscow, 127994 Russia Received July 24, 2008
Abstract—Physical processes that take place in a strip electrode during welding using the slatted splicing technique are considered. Flowing of the welding current in the electrode is shown to be the key process which determines electrode heating and melting. Technological receipts are proposed that allow obtaining highquality welds by the method of slatted splicing. DOI: 10.1134/S1063780X10130325
1. INTRODUCTION Welding of thick components without preliminary grooving is a complex engineering problem. The exist ing techniques of electronbeam and electroslag weld ing, used to this effect, are characterized by some drawbacks [1] and sometimes substantially complicate the process of component production. In some cases, thick components can be successfully welded using arc welding with a stationary consumable electrode (AWSCE)—a novel technique of fusion welding. Arc welding with a stationary consumable elec trode is one of the most efficient and highly productive methods of fusion welding of thick components [2, 3]. It is most relevant to utilize AWSCE for making welded joints in the absence of workspace for housing welding equipment, in hardtoreach and closed areas, as well as in apartments containing explosive media and the substances which are detrimental to the health of the attending personnel. Remote control over the process of welding can be easily established that allows making welds in the areas with radiation pollution, thus mini mizing the time spent by the operating staff in the dan gerous zone. The diagram of the AWSCE is given in Fig. 1. The dielectric coating with the thickness Δ is deposited on a strip electrode with the thickness δ. The electrode is placed without a gap between the welded parts of the component with the thickness H. Welding flux is spilled onto the assemblage top. The electric arc is excited by a short circuit between the electrode metal and the component parts to be welded at the assem blage flank. At some specified parameters of the power source a selfoscillating process, providing for high velocity selforganizing motion of the electric arc in the slatted splicing, is initiated in the open nonequilib rium system “electrode–electric arc–weld pool.” When joining thick components, the welding rate drastically depends on the thickness of the material to be welded and is 1.3–0.7 cm/s for the components
with the thickness of 10–50 mm [4]. The welding power being the same, no other known method of arc welding is characterized by such a speed [1]. The phe nomenal rate of this technique is attributed to pecu liarities of the physical processes, which take place in a strip electrode and the parent metal during welding. 2. PHYSICAL PROCESSES DURING AWSCE Let us consider the phenomena which take place in a strip electrode during slatted splicing te
Data Loading...
