| 摘要 |
1,050,087. Ultrasonic weld testing. J. KRAUTKRAMER and H. KRAUTKRAMER. Feb. 12, 1964 [Feb. 12, 1963], No. 5956/64. Heading H4D. An extended seam weld 3, Fig. 1, is tested by ultrasonic pulses by means of probes 1 and 2 positioned either side of the seam and directed on to the right and left flanks of the seam respectively and moved in the mean direction of the seam while maintaining a constant distance from each other, and recording means, Fig. 2 (not shown), comprising a recording system for each probe, the indicating means 9 and 10 of each system having an initial position corresponding to the position of the respective probe and a direction of displacement corresponding to the direction of the respective probe, and the indications being made together on a single record. The recording means of Fig. 2 is a strip pen recorder, comprising a roll of paper 7 moving in the opposite direction to the probes, a pen 9 actuated to move in response to signals from probe 1 and a pen 10 actuated to move in response to signals from probe 2. Indications corresponding to a crack 5, a gap 4 in the left flank, and a slag point 6, are shown at 12, 13 and 14 respectively. Indications due to the different probes may be made in different colours. An alternative recording means may comprise a photographic film moving past a multi-beam C.R.T., each beam being associated with one of the probes to produce a scan line having a direction corresponding to the direction of the respective probe and a starting position corresponding to the position of said probe. An echo may be shown on the scan line by an intensification of light arc on A-scan type deflection. The nature of the fault producing the colour may be determined by said intensification on deflection. In the case of a weld having a smooth bead surface wave testing probes may be provided to produce corresponding true to position indications. Additional probes may be provided to transmit energy to the seam at different angles. |
