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为了给于截面为12×12毫米~2试样模拟焊接热循环,设计了采用电阻加热和水冷铜夹具冷却的焊接热模拟装置,本装置采用闭环控制系统,正确地控制试样的温度——时间循环。采用焊在试样加热区的热电偶作为测温、控温的传感器,由光电输入数控热循环定值器产生定值信号,采用二位式温度控制器,由数字程序能量控制器合理选择热循环各部分所需的加热能量,保证了装置能正确地模拟焊接热循环。本装置具有操作简单、调试方便、重复性好、更换热循环曲线方便、可靠等优点。 利用本装置对二种低合金钢进行了模拟加热试验。并对模拟加热试样进行了金相观察以及冲击试验。
In order to simulate the welding thermal cycle of 12 × 12 mm ~ 2 specimen, a welding thermal simulation device using resistance heating and water cooled copper fixture cooling is designed. The device adopts a closed-loop control system to control the temperature of the sample correctly - Time loop. Adopt the thermocouple welded in the heating area of the sample as the sensor of temperature measurement and temperature control, the set value signal is generated by the photoelectric input numerical control thermal cycle setter, and the two-position temperature controller is used, which is reasonably selected by the digital program energy controller Circulating all the required heating energy, to ensure that the device can correctly simulate the welding thermal cycle. The device has the advantages of simple operation, convenient debugging, good repeatability, convenient and reliable replacement of the thermal cycle curve, and the like. Two kinds of low alloy steels were simulated and heated by this device. Metallographic observation and impact test were carried out on the simulated heating samples.