Digital radiograohic testing of the weld seam of welded steel tubes for the detection of imperfections

々 Single wall techniques-Class A

Specified wall thickness T	Wire number Diameter	Specified wall thickness T	Hole number Diameter	Specified wall thickness T	Duplex IQI^ab
Specified wall thickness T	Wire number Diameter	Specified wall thickness T	Hole number Diameter	Specified wall thickness T	Unsharpness	Wire diameter and spacing
T≤1.2	W18 0.063	T≤ 2	H3 0.20	T≤2	D11 0.6	0.080
1.2＜T ≤2	W17 0.08	2＜T ≤3.5	H4 0.25	2＜T ≤5	D10 0.20	0.100
2＜ T≤3.5	W16 0.10	3.5＜T ≤6	H5 0.32	5＜T ≤10	D9 0.26	0.130
3.5＜T ≤5	W15 0.13	6＜T ≤10	H6 0.40	10＜T ≤25	D8 0.32	0.160
5＜ T≤7	W14 0.16	10＜T ≤15	H7 0.50	25＜T ≤55	D7 0.40	0.200
7＜ T≤10	W13 0.20	15＜T ≤24	H8 0.64	55＜ T	D6 0.50	0.250
10＜ T≤15	W12 0.25	24＜T ≤30	H9 0.80
15＜T ≤25	W11 0.32	30＜T ≤40	H10 1.00
25＜T ≤32	W10 0.40	40＜T ≤60	H11 1.25
32＜T ≤40	W9 0.50	60＜ T	H12 1.60
40＜T ≤55	W8 0.63
55＜T	W7 0.80
^aDuplex IQI should be used in conjunction with either a wire or step/hole IQI. ^b Duplex IQI should be examined using a profile display;the smallest wires whicj have a dip separation below 20 % between the wire pair determine the unsharpness.

々 Single wall techiques-Class B

Specified wall thickness T	Wire number Diameter	Specified wall thickness T	Hole number Diameter	Specified wall thickness T	Duplex IQI^ab
Specified wall thickness T	Wire number Diameter	Specified wall thickness T	Hole number Diameter	Specified wall thickness T	Unsharpness	Wire diameter and spacing
T≤1.5	W19 0.05	T≤2.5	H2 0.16	T≤1.5	D13+ ＜0.40	＜ 0.05
1.5＜T≤2.5	W18 0.063	2.5＜ T≤4	H3 0.20	1.5＜ T≤4	D13 0.10	0.05
2.5＜T ≤4	W17 0.08	4＜ T≤8	H4 0.25	4＜ T≤8	D12 0.13	0.065
4＜T ≤6	W16 0.10	8＜ T≤12	H5 0.32	8＜ T≤12	D11 0.16	0.080
6＜T ≤8	W15 0.13	12＜ T≤20	H6 0.40	12＜ T≤40	D10 0.20	0.100
8＜T ≤12	W14 0.16	20＜ T≤30	H7 0.50	40＜ T	D9 0.26	0.130
12＜T ≤20	W13 0.20	30＜ T≤40	H8 0.65
20＜T ≤30	W12 0.25	40＜ T≤60	H9 0.80	＜ T≤
30＜T ≤35	W11 0.32	60＜ T	H10 1.00
35＜T ≤45	W10 0.40
45＜T ≤65	W9 0.50
65＜ T	W8 063
NOTE D13+ is achieved if the duplex wire paor D13 is resolved with a dip＞ 20% ^aDuplex IQI should be used in conjunction with either a wire or step/hole IQI. ^b Duplex IQI should be examined using a profile display;the smallest wires which have a dip separation below 20% between the wire pair determine the unsharpness.