摘要
对液压支架用中厚Q960钢板进行焊接热模拟试验,分析了不同冷却速率(0.5~100℃·s^(-1))下热影响区粗晶区的显微组织和硬度;通过铁研试验和焊接接头力学性能试验,对机器人焊接工艺进行了确定。结果表明:在焊前预热100℃条件下,当冷却速率低于80℃·s^(-1),即焊接热输入大于6.5 kJ·cm^(-1)时,模拟得到热影响区粗晶区硬度可稳定在420 HV以下;在焊前100℃预热,焊接热输入为13.95 kJ·cm^(-1)条件下,机器人焊接Q960钢板接头具有良好的抗冷裂纹敏感性;匹配ER96-G焊丝,13.02~15.18 kJ·cm^(-1)焊接热输入下机器人焊接中厚Q960钢板接头的性能均能满足标准要求。适宜的机器人焊接参数为焊前预热100℃、焊接电流460 A、电压33 V、焊接速度60 cm·min^(-1)、送丝速度8.5 m·min^(-1),此时焊接熔敷率可达到8 kg·h^(-1)。
The welding thermal simulation test was conducted on medium thick Q960 steel plate for hydraulic supports.The microstructure and hardness of the coarse-grained heat-affected zone under different cooling rates(0.5-100℃·s^(-1))were analyzed.The robot welding process was determined by Tekken test and welded joint mechanical performance tests.The results show that the simulated hardness of coarse-grained heat-affected zone could be stabilized below 420 HV when the cooling rate was lower than 80℃·s^(-1),namely the welding heat input was greater than 6.5 kJ·cm^(-1)under the preheated temperature of 100℃.The Q960 steel plate joint welded by robot welding had excellent cold crack resistance sensitivity under the welding heat input of 13.95 kJ·cm^(-1)and the preheated temperature of 100℃.The properties of robot welding Q960 steel plate joint could meet the standard requirements within the welding heat input of 13.02-15.18 kJ·cm^(-1)with ER96-G welding wire.The recommended welding parameters for robot welding were listed as follows:preheating at 100℃,welding current of 460 A,voltage of 33 V,welding speed of 60 cm·min^(-1) and wire feed rate of 8.5 m·min^(-1),and the welding deposition rate could reach 8 kg·h^(-1).
作者
兰志宇
陈尹泽
李争
LAN Zhiyu;CHEN Yinze;LI Zheng(Zhengzhou Coal Mining Machinery Group Co.,Ltd.,Zhengzhou 450016,China;Anyang Iron&Steel Group Co.,Ltd.,Anyang 455004,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2023年第11期12-17,24,共7页
Materials For Mechanical Engineering
基金
河南省重大科技专项项目(161100211300)。
关键词
中厚Q960钢板
机器人焊接
焊接热模拟
力学性能
medium thick Q960 steel plate
robot welding
welding thermal simulation
mechanical property
