利用热模拟试验机Gleeble3500模拟单、双丝埋弧焊条件下线能量分别为19、25、39、50 k J/cm时的G3钢粗晶区组织。对模拟的粗晶区组织、硬度和耐磨性能进行了研究。结果表明,随线能量增加,粗晶区晶粒长大,同时针片状析出物析出、聚集、长大。线能量≤39 k J/cm时,其对粗晶区的硬度、耐磨性等影响不大,但当线能量增加到50 k J/cm时,粗晶区晶粒显著长大,析出物有重熔迹象,硬度降低、耐磨性变差。 The Gleeble coarse grains of G3 steel were simulated by Gleeble3500 thermal simulator at single wire and double wire submerged arc welding with the energy of 19, 25, 39 and 50 kJ / cm, respectively. The simulated coarse grain zone structure, hardness and wear resistance were studied. The results show that with the increase of the line energy, the grains grow in the coarse grain region, and the precipitates of the needle flake precipitate, aggregate and grow up. When the linear energy is less than or equal to 39 kJ / cm, the effect on the hardness and wear resistance of the coarse-grained zone is not significant. However, when the energy of the line is increased to 50 kJ / cm, the grains in the coarse-grained zone grow significantly and the precipitates There are signs of remelting, hardness decreased, poor wear resistance.