The Possible Explanation of the Self-Cleaning Effect During Explosion Welding as a Result of Thermal Stresses Occurrence
Nowadays the explosion welding is one of the most popular methods of the production of bimetals. However, some of the key effects of explosion welding have not been fully and definitely described yet despite of numerous researches. The fundamental effect of explosion welding is the jetting action which occurs just before the collision point. The jet consists of the particles of metals and surface contaminants providing the self-cleaning of welding surfaces. The exact mechanism of the jet formation is not clear enough even now after the decades of international investigations. A possible explanation of the self-cleaning effect during the explosion welding of metals is presented in our research. Titanium alloy, aluminum alloy and carbon steel were chosen for the research because of their common use in explosion welding process. It is known that the temperature of atmosphere between welding metal plates rapidly grows up after the explosion till the collision of plates. It was supposed that the near-surface layers of the metals under study were fractured due to a thermal shock caused by the instantly heated atmosphere. The estimation was based on the particular solution of the dynamic thermoelastic equations considered in the works of A. D. Kovalenko. The estimated temperatures of the atmosphere required for the failure of near-surface layers were obtained by the comparison of thermal equivalent stresses and the ultimate tensile strengths of the metals. The obtained temperatures were about 500 to 1500 K while the known experimental temperatures are 2500 to 7000 K. It was obtained from the comparison of estimated and experimental temperatures that the failure of near-surface layers of metals due to thermal shock was theoretically possible. This research is significant for the development of the explosion welding theory. The majority of researchers considered that jetting action was related to Munroe effect, but the hypothesis had not been verified experimentally. However, our research showed that Munroe effect could not take place during the explosion welding.
BERDYCHENKO A.A. FLAT M.H.
Altai State Technical University,Barnaul,Altai territory,Russian Federation
国际会议
2011 International Autumn Seminar on Propellants,Explosives and Pyrotechnics(2011国际推进剂、炸药、烟火技术秋季研讨会)
南京
英文
428-432
2011-09-20（万方平台首次上网日期，不代表论文的发表时间）