Biuletyn Instytutu Spawalnictwa No. 01/2012

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No. 01/2012 BIMONTHLY Volume 56 CONTENTS • J. Dworak - Impact of laser beam shape on YAG pulsed laser welding..................... 5 • A. Sawicki - Modified Habedank and TWV hybrid models of the arc with variable length for simulating processes in electrical devices ..................................................... 15 • E. Turyk, A. Żydzik-Białek, M. Bormann, A. Jastrzębiowski, M. Kościelniak, T. Kuzio, B. Czwórnóg - Repair welding of elements of the sign “ARBEIT MACHT FREI” of the main gate to the former German Nazi concentration and extermination camp Auschwitz I....................................................... 23 • A. Kiszka, T. Pfeifer - Variable polarity MAG welding of thin protective-coated steel plates...................................................................................................................... 33 • M. St. Węglowski - Testing electromagnetic radiation of welding arcin TIG method from welding process monitoring point of view................................................ 40 INSTITUTE OF WELDING The International Institute of Welding and The European Federation for Welding, Joining and Cutting member
Summaries of the articles J. Dworak - Impact of laser beam shape on YAG pulsed laser welding The study presents the general characteristic of laser welding with a radiation beam emitted in the pulsed mode and explains the characteristics of the energy-related parameters of a pulsed radiation beam. The text indicates the shape of a pulse (specific course of power changes within the duration of a pulse) as one of the parameters of a laser beam influencing the process of welding, particularly of thin precise elements. Examples of penetrations and welded joints were used to illustrate the possibility of changing the shape of a weld and the manner of weld metal crystallisation by applying laser beam pulses of diversified shapes. A. Sawicki - Modified Habedank and TWV hybrid models of the arc with variable length for simulating processes in electrical devices The paper indicates main difficulties in determination of characteristics and mathematical modelling of the electric arc. Limitations in practical use of the simplified and combined models of discharge with constant plasma column length have been pointed out. New plasma column models with variable arc length have been presented. The models consist of series or parallel connected elements corresponding to the modified Cassie-Berger and Mayr-Kulakov ones. E. Turyk, A. Żydzik-Białek, M. Bormann, A. Jastrzębiowski, M. Kościelniak, T. Kuzio, B. Czwórnóg -Repair welding of elements of the sign “ARBE- IT MACHT FREI” of the main gate to the former German Nazi concentration and extermination camp Auschwitz I The article presents theft-accompanying damage to the sign “ARBEIT MACHT FREI” and discusses the requirements of the Conservation Section of the Auschwitz-Birkenau State Museum related to the joining of the sign elements and the extent of conservation performed. The study also covers the process and results of the work regarding the technology of the repair welding of the sign carried out at Instytut Spawalnictwa and addresses the issue of welding-related technological supervision. A. Kiszka, T. Pfeifer - Variable polarity MAG welding of thin protectivecoated steel plates The study presents results of research on the application and usability of variable polarity MAG welding of thin protective-coated sheets in automotive industry. The research-related process was carried out using OTC Daihen DW 300 and Cloos Qineo Champ welding devices. The study also discusses the influence of EN ratio in the course of current and voltage on the stability of process, quality of joints, and the degree of damage to protective coating. M. St. Węglowski - Testing electromagnetic radiation of welding arc in TIG method from welding process monitoring point of view The study presents the results of tests of welding arc electromagnetic radiation in TIG method. Within the research it was necessary to carry out an extensive overview of reference publications about arc radiation and applied testing methods. Taking advantage of an arc model in TIG method described in reference publications it was possible to determine a dependence of welding current intensity and welding arc length on the intensity of welding NR 01/2012 BIULETYN INSTYTUTU SPAWALNICTWA 3
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Page 5 and 6: Jerzy Dworak Research Impact of las
Page 7 and 8: cess being carried out at a specifi
Page 9 and 10: pulses up to several dozen millisec
Page 11 and 12: ectangular pulse, P i max =702 W, p
Page 13 and 14: ectangular pulse, P i max =1752 W s
Page 15 and 16: Antoni Sawicki Modified Habedank an
Page 17 and 18: 1 dr r dt - in the resistance form
Page 19 and 20: The conditions of the selection of
Page 21 and 22: Similarly as previously (37), one c
Page 23 and 24: Eugeniusz Turyk, Agnieszka Żydzik-
Page 25 and 26: gical weldability, confirmed by the
Page 27 and 28: Damage was also caused to the welde
Page 29 and 30: Initial selection of method for wel
Page 31 and 32: Fig. 19. Assembly table with fixed
Page 33 and 34: Agnieszka Kiszka, Tomasz Pfeifer Va
Page 35 and 36: Fig. 4. Course of changes in curren
Page 37 and 38: extreme, the process was less stabl
Page 39 and 40: Fig. 13. Macrostructure of T-shaped
Page 41 and 42: L=1 mm, I=25 A L=1 mm, I=50 A L=1 m
Page 43 and 44: case of TIG welding (for similar we
Page 45 and 46: Other, equally important research i
Page 47 and 48: tion of a function connected with t
Page 49 and 50: The intensity of arc radiation was
Page 51 and 52: On the basis of calculations (Table
Page 53 and 54:
NR 01/2012 BIULETYN INSTYTUTU SPAWA
Page 55:
INSTYTUT SPAWALNICTWA The Polish We
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Biuletyn Instytutu Spawalnictwa No. 01/2012

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