摘要
通过富氩气体保护焊方法,采用准1.2 mm的MK.GHS80焊丝对30 mm厚煤机支架用Q690钢板进行接焊,分别研究了线能量、层间温度和焊后热处理温度对接头强度和冲击韧性的影响。结果表明,随着线能量增加,焊缝的抗拉强度和屈服强度均降低,当线能量超过2.244 k J/cm时,焊缝抗拉强度低于母材;焊缝和HAZ冲击性能均降低。随着层间温度的升高,焊缝的抗拉强度和屈服强度降低;焊缝和HAZ冲击性显著降低。随着焊后热处理温度的升高,焊缝的抗拉强度和屈服强度升高,其中温度对屈服强度影响较大;焊缝和HAZ冲击性能降低,当温度达到350°C以上时HAZ的冲击性能迅速恶化。
By the rich argon gas metal arc welding method, the Ф1.2 mm MK.GHS80 wire were used in the welding of 30 mm thickness Q690 steel plate for coal machinery hydraulic support, the influence of the heat inputs, interpass temperatures and post weld heat treatment temperature on the strength and impact toughness of welding joints were studied. Results show that with heat inputs increase, the tensile strength and yield strength of weld metal is reduced, and the weld tensile strength is lower than the parent metal when the heat input is over 2.244 kJ/cm; Weld and HAZ impact properties are also reduced with the heat inputs increasing. With the increase of interpass temperature, the tensile strength and yield strength of weld is reduced; Weld and HAZ impact significantly reduced. With the increase of post weld heat treatment temperature, the tensile strength and yield strength of weld metal is increased, and it shows great influence on the yield strength; Weld and HAZ impact performance is reduced, HAZ impact performance is deteriorated rapidly when the temperature is above 350 ℃.
出处
《煤矿机械》
北大核心
2014年第11期157-158,共2页
Coal Mine Machinery
