履带式起重机的桁架臂主要由主弦杆、斜杆、连接头等部件焊接而成(见图1)。由于使用、管理、转运不当和疲劳等原因,吊臂的主弦杆或斜杆可能会发生损伤、变形、开裂等问题。及时发现吊臂的主弦杆及斜杆的开裂等缺陷,采取正确的焊接修复工艺修复,对于降低机器的停机时间,延长机器的使用寿命,确保施工安全都非常重要。 Crawler crane truss arm mainly by the main chord, diagonal, connectors and other components welded (see Figure 1). Due to the use, management, improper transport and fatigue and other reasons, the main chord or diagonal boom boom may occur damage, deformation, cracking and other issues. Timely detection of cracking of the main chord and diagonal bar of the boom, etc., and correct repair of the welding process, are very important for reducing the machine downtime, extending the service life of the machine and ensuring the construction safety.