摘要
逐一对比解析液压支架结构件常见的缺欠标准ISO 5817和MT/T 587,主要包括缺欠类别、相应的检测等级和验收等级。国内外标准主要差异性表现为:(1)缺欠验收仅是MT/T 587的一部分,其适用范围广于ISO 5817,但没有ISO 5817系统、具体和全面;(2)MT/T 587仅对表面缺欠和几何形状缺欠有具体规定,但未对内部缺欠详细解释,仅要求缺欠验收符合GB/T 11345规定;(3)关于表面缺欠和几何形状缺欠,MT/T587-Ⅰ类比ISO5817-C级评定更为苛刻。最后,制定了常见缺欠的应对措施:(1)为降低应力集中,宜采取焊趾打磨;(2)两标准均允许内部气孔和夹杂缺欠存在,但应满足评定极限值;(3)几何形状缺欠虽然降低了接头的承载力,但可增加焊缝厚度进行补偿。
This paper compares and analyzes ISO 5817 and MT/T 587 one by one,which are common domestic and foreign defect standards of hydraulic support structures,main including defect categories,corresponding detection levels and acceptance levels.Main differences between domestic and foreign standards are as follows:1.Defective acceptance is only a part of MT/T 587,which scope of application is more wider than ISO 5817,but it is less systematic,concrete and comprehensive;2.MT/T 587 only has specific provisions on surface defects and geometric shape defects.However,it does not explain internal defects in detail and defective acceptance is only required to comply with GB/T 11345 provision;3.As for surface imperfec-tions and geometric imperfections,Ⅰclass level of MT/T587 is more critical than C class level of ISO5817.Finally,counter-measures of common imperfection are formulated:1.To reduce stress concentration,it is recommended to adopt welding toe grinding;2.Both standards allow the existence of internal porosity and inclusion defects,but should meet the assessment limit;3.Although defect of geometric shape reduces the bearing capacity of the joint,it can increase thickness of the welding seam to compensate.
作者
李福永
杨高
白海明
LI Fuyong;YANG Gao;BAI Haiming(Zhengzhou Coal Mining Machinery Group Co.,Ltd.,Zhengzhou 450016,China;Harbin Welding Training Institute,Harbin 150046,China)
出处
《电焊机》
2020年第1期88-91,I0009,共5页
Electric Welding Machine
关键词
液压支架
缺欠标准
对比解析
差异性
应对措施
hydraulic support
defect standards
compare and analyze
otherness
countermeasures
