Employing the L_CR Waves to Measure Longitudinal Residual Stresses in Different Depths of a Stainless Steel Welded Plate

Table 1

The results of L_CR depth measurement.

1 MHz			2 MHz			4 MHz			5 MHz
𝐷	𝐴	𝑇	𝐷	𝐴	𝑇	𝐷	𝐴	𝑇	𝐷	𝐴	𝑇
0	0.75	13.09	0	0.55	10.91	1	0.35	10.58	1	0.28	10.6
0.5	0.66	13.1	0.5	0.5	10.93	1.5	0.3	10.6	1.5	Noise	—
1	0.6	13.14	1	0.42	10.98	2	Noise	—
1.5	0.54	13.18	1.5	0.4	11.02
2	0.49	13.21	2	0.34	11.06
2.5	0.47	13.26	2.5	Noise	—
3	0.43	13.29
3.5	0.42	13.33
4	0.4	13.37
4.5	0.33	13.37
5	0.2	13.37
5.5	Noise	—

^∗𝐷: depth of machining (mm); 𝐴: amplitude; 𝑇: time of flight (μs).