6.3 探头相对于焊缝几何形状的位置
超声缺陷探测辅导
焊缝检测程序通常要求从被测样件的两个或多个不同位置进行检测，以覆盖焊缝的整个体积，并在所要求的方向上发射声波，以从常见的缺陷处生成反射信号。在所有情况下，都必须来回扫查探头，以在整个焊缝体积范围内发射声束。某个检测的特定程序必须总是由检测人员，基于工件的几何形状和检测要求制定。
Probe Positions for Weld Inspection
BUTT WELD
Primarily inspected from the sides using an angle beam probe, testing is done on both the left and right sides of the weld.
A secondary test with a straight beam transducer checks for laminar cracking in the heat affected zone. Testing is also done on each side of the weld.
T WELD
T WELDS also typically require inspection with both angle beam and straight beam probes, testing with an angle beam from both the flange and web and with a straight beam from the flange.
LAP WELD
Full penetration lap welds are commonly tested with an angle beam probe coupled to the upper plate.
CORNER WELD
Full penetration corner welds are commonly tested with an angle beam probe aligned both perpendicular to the weld and from a direction representing a small rotation from parallel.
