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【答案】应助回帖
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zoe122208: 金币+50, 翻译EPI+1, ★★★★★最佳答案 2013-12-27 23:18:02
The reason for this kind of intermittent and particular wave peaks is: under the force of magnetic fields, the aluminum pipe accelerates. During deformation of material at the end of the aluminum pipe and due to the small gap, speed does not reach the critical value. Hence the steel pipe temperature does not rise much and the relative movement of the inner and outer pipe is not sufficient for shear conditions. While the distance increases, the aluminum pipe speed gradually increases and when it reaches the critical collision value, the high speed collision makes the steel material temperature rapidly increase and hence softens. The movement of the aluminum pipe will easily "wrap up" some steel, hence forming special wave peaks. The reason why these wave peaks do not exceed the transitional area range is that at the onset of forming the transitional area, the temperature is high and its strength and hardness are both lower than the mother material and the "wrapped up" steel can easily move inside the transitional area. When the steel material reaches a certain height to meet the harder aluminum, the aluminum will move along the welding direction and carry the wave peaks also move in the same direction, causing a tilting formation. Since the materiel has very high yield strength under high stain rate, as the distance continues to increase, the work needed to overcome the material's resistance to deformation continues to increase. The speed decreases and similar to the onset period, only regular corrugated wave forms occur.
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