环境温度低于零度焊接作业指导书.pdf

环境温度低于0 oC 焊接作业指导书 Welding instruction when environment temperature below 0 oC 1. 适用范围Scope 规定了我厂在造船舶船体结构普通钢，高强度钢对接，角接焊缝预热要求。 This instruction specifies requirements for hull structure normal strength and higher strength steels butt joint and fillet joint preheating. 2. 引用标准Reference standard IACS NO.47 Shipbuilding and Repair Quality Standard (Rev.4, Aug.2008) 3. 预热、测量工具Pretesting and measurement equipment 3.1 采用氧乙炔割炬烘焙方法对焊缝两边母材进行预热。 Base metal both sides of welding to be preheating by oxyacetylene Welding Cutting torches baking method. 3.2 采用点温计进行温度测量。 Temperature to be measured by point temperature gauge. 4. 预热要求及温度测量点要求 Requirements of preheating and temperature measurement points 4.1 对于普通钢（A,B,D,E ），当环境温度低于-5 C 时，需要对焊缝两边的母材进o 行预热，最低预热温度大于20 C ；o When environment temperature is below -5 oC , it shall be preheated for normal strength steels (A, B, D, E), and the lowest preheating temperature shall be more than o 20 C . 4.2 对于高强度钢（AH32-EH32,AH36-EH36 ），当环境温度低于0 oC ，需要对焊 缝两边的母材进行预热，最低预热温度大于20 oC 。 When environment temperature is below 0 oC , it shall be preheated for higher strength steels (AH32-EH32, AH36-EH36), and the lowest preheating temperature o shall be more than 20 C . 4.3 为了避免局部预热过度，预热温度不能大于250 oC 。 In order to avoid local excessive preheating, preheating temperature can not exceed 250 oC 1 / 4 环境温度低于0 oC 焊接作业指导书 o Welding instruction when environment temperature below 0 C 4.4 温度测量点 Temperature measurement points 温度测量一般在正对着焊工的工件表面， The temperature measurement shall normally be made on the surface of the workpiece facing the welder 4.4.1 宽度测量区域如图