为了防止大厚钢板在焊接时发生横向裂纹,通常采用提高焊前予热和层间保温温度,以及多次进行焊接中间退火和焊后热处理的措施。这不仅使工时增加,而且还会恶化焊接接头性能。为此,研究了省去焊接过程中间热处理,用其它措施来保证不发生横向裂纹的问题。所用试板为50 In order to prevent large-thickness steel plate in the transverse cracks occur when welding, usually to improve the pre-weld preheating and insulation temperature between the layers, as well as repeated welding intermediate annealing and post-weld heat treatment measures. This not only increases the man-hours, but also deteriorates the performance of welded joints. To this end, the study eliminates the heat treatment during the welding process, with other measures to ensure that no horizontal cracks occur. The test plate used is 50