作业指导书(四) Task Steering （第一版1nd edition）编制：审核：批准：执行日期：2007年10月20日1、简介General1.1本工艺旨在叙述薄板焊缝，如外板对接缝的超声波探伤（UT）方法。
本工艺介绍的方法目前在AWS D1.1中未详述，但在其它应用中被证明可行。
The workmanship is describled about welding seam of thin palte,such as method of UT to butt joint seam of external plate.This workmanship introduction is describled in AWS D1.1,but in other experiments are to be proved useful.1.2AWS D1.1:2006附录K通常用于板厚小于8mm的焊件的超声波检测。
AWS D1.1:2006 attach K usually do UT for less than 8mm thickness weldment.2、工艺要求Workmanship Requirement2.1用本工艺可检测的焊缝类型The type of welding seam what this workmanship can inspect使用埋弧焊(SAW)，药芯焊丝气体保护焊(FCAW)，气体保护钨极电弧焊(GTAW)或药皮焊条电弧焊(SMAW)焊接，两母材板厚相同的对接焊缝均可使用此工艺进行检测。
其它焊缝形式须单独鉴定和单独的工艺。
This workmanship can inspect SAW,FCAW,GTAW or SMAW,butt joint seam of the same thickness of base material.Other welding seam must have individual inspect and workmanship.2.2可用于检测的设备类型Equipment type of inspection符合6.22.1(AWS D1.1:2006)要求的任何超声波检测设均可使用。
如果有能力检测出试验样板的缺陷且达到本工艺要求时，可以使用其它设备，见2.6至2.11。
UT idetection device can be used in accordance with 6.22.1(AWS D1.1:2006).If other equipments can inspect limitation of trail sample plate and in accord with workmanship request,then allow to use.see 2.6—2.112.3探头Search unit探头应符合6.22.6或6.22.7(AWS D1.1:2006)。
Search unit should be in accordance with 6.22.6 or 6.22.7(AWS D1.1:2006). 2.3.1直（纵波）探头Straight(longitudinal wave) search unit直(纵波)探头晶片有效面积不小于323mm2，也不要大于645mm2。
探头可圆可方。
探头应按6.29.1.3 1(AWS D1.1:2006)所述要进行三次反射。
The wafer effective area of straight(longitudinal wave) search unitshould be between 323mm2 and 645mm2 .Either round or square isallowed to search unit.Search unit shall do three times reflect as 6.29.1.31(AWS D1.1:2006) requested.2.3.2斜探头Inclined search unit2.3.3斜探头包括探头和入射角度。
Inclined search unit include search unit and incidence angle2.3.2.1频率Frequency探头频率应在2到6MHz之间，包括2和6MHz。
Search unit frequency shall between 2 and 6 MHz,include 2 and 6MHz. 2.3.2.2探头尺寸Search unit dimension探头晶体外形可为正方形或矩形，宽度范围为15~25 mm，高度范围为15~25 mm。
最大宽高比为1.2比1.1，最小宽高比为1.0比1.0。
The wafer externality of search unit shall be square orrectangle,width scope is 15~~25mm,height scope is 15~~25mm.Thelargest rate of width and height is 1.2:1.1,the smallest rate of widthand height is 1.0:1.0.2.3.2.3探头角度Search unit angle探头角度在68到72度之间。
Search unit angle shall between 68 and 72 degree.2.3.2.4标记Marking每个探头应明确标记探头频率，理论反射角和入射点。
入射点定位方法如6.29.2.1(AWS D1.1:2006)所述。
Each search unit shall mark search unit frequency,angle of reflection andpoints of incidence. The orientation method of points of incidence shall inaccordance with 6.29.2.1(AWS D1.1:2006).2.3.2.5内部反射Internal reflection最大允许内部反射如6.24.3 1(AWS D1.1:2006)所述。
The biggest allowance of Internal reflection shall in accordance with6.24.3 1(AWS D1.1:2006).2.3.2.6边缘距离Edge distance.探头尺寸是指从探头导入边缘到入射点之间的距离，它不超过25mm。
Search unit dimension is from guide edge to points of incidencedistance,less than 25mm.2.3.2.7IIW 块ⅡW Sample使用IIW标准块方法应符合6.29.2.6(AWS D1.1:2006)，如图6.21(AWSD1.1:2006)所示。
The standard method of use ⅡW sample shall in accordance with6.29.2.6(AWS D1.1:2006),see picture 6.21(AWS D1.1:2006).2.3.2.8附加校准块Additional calibration block要求有一个校准块，如下：A calibration block is requested,see as follow:2.3.2.8.1接头结构Search unit structure只有坡口对接接头才能使用。
Bevel butt joint search unit can be only used.2.3.2.8.2材料类型Material type试验板材料须与实际焊接中使用的材料相同。
The material of sample plate shall be same as actual welding.2.3.2.8.3材料厚度Material thickness生产中检测的材料厚度应不大于试验样板的厚度。
Material thickness is needed to inspect that shall not thicker thansample plate during fabrication.2.3.2.8.4缺陷尺寸，方向和位置limitation demision,direction and position为可表示在生产焊缝中可能要出现的缺陷，试样应用标准块。
此标准块包括一个直径为1.5 mm，平行于焊缝轴线，位于熔合区且贯穿试验板的通孔。
见图1: 典型标准块位置。
In order to display limitation of welding that may beoccurred,sample shall use standard one.There is a through hole inthis standard sample,which shall be 1.5mm diameter,parallelwelding seam axes,locate in fusion area and through sample plate.See picture 1:standard sample position2.3.2.8.5缺陷类型和位置limitation type and position在执行本工艺选择水平III时，标准块可存在其它类型缺陷。
如有意识地让坡口焊缝未焊透，夹钨，焊缝塞入垫圈或螺母，或者其它能提供的与在实际生产中可能遇到的缺陷信号相同的方法。
除了2.3.2.8.4条所指的钻孔外，包含缺陷的任何试验校准块应先进行射线探伤以确定缺陷尺寸、方位。
画出标准块图与射线底片一起存档备案。
Technological choice in the implementation of the level III, thestandard block may exist other types of defects. If so that the senseof groove weld lack of penetration, folder tungsten, insert washersor weld nut, or to provide other in the actual production may signaldefects encountered the same way. Apart from the meaning ofsection 2.3.2.8.4 bored, contains flawed calibration block any trialshould be conducted to determine the defect-detection size, position.Standard block map drawn-ray film archive with the record.2.3.2.8.6校准严禁使用角落反射。