Standard Series of Impeders with Return Flow Assembly

Standard dimensions of return flow (R/F) assembly impeders based on ferrite cores produced by TDK (Japan) and intended for a high-frequency tube welding.

Standard Series of Assembly Impeders Return Flow

Return flow assembly impeders are recommended usually for cases where it is important and necessary to preserve an internal diameter of welded tube in dry conditions in following cases: for example, when producing tubes on the base of stainless steel or when an internal weld grinding is necessary. In the latter case, To ensure fastening of the internal joint cleaning device, for small pipe diameters cores with special configuration with a cut sector are used. For large size tubes, a fixture of trimming device for internal seam is made via a central hole of ZRSH core.

The required condition for secure and long-term operation of impeder is the providing of reliable system of cooling and filtration.

Nomenclature List

Diameter of Impeder’s Casing (D_outer × d_inner), mm	TDK’s Ferrite Cores
11.5 × 10.5	ZRSH 10 × 5 × 200
12.5 × 11.5	ZRSH 11 × 5 × 200
13.5 × 12.5	ZRSH 12 × 5 × 200
14.5 × 13.5	ZRSH 13 × 5 × 200
16 × 14.5	ZRSH 14 × 5 × 200
18 × 16	ZRSH 15 × 5 × 200
19 × 17	ZRSH 16 × 5 × 200
20 × 18	ZRSH 17 × 5 × 200
22 × 19	ZRSH 18 × 5 × 200
23 × 20	ZRSH 19 × 9 × 200
23 × 21	ZRSH 20 × 10 × 200
24 × 22	ZRSH 21 × 10 × 200
25 × 23	ZRSH 22 × 11 × 200
27 × 24	ZRSH 23 × 11 × 200
29 × 25	ZRSH 24 × 12 × 200
30 × 26	ZRSH 25 × 12 × 200
31 × 27	ZRSH 26 × 13 × 200
32 × 28	ZRSH 27 × 13 × 200
33 × 30	ZRSH 29 × 14 × 200
35 × 31	ZRSH 30 × 15 × 200
36 × 33	ZRSH 32 × 16 × 200
39 × 35	ZRSH 34 × 17 × 200
41 × 37	ZRSH 36 × 18 × 200
43 × 39	ZRSH 38 × 19 × 200
45 × 41	ZRSH 40 × 20 × 200
48 × 43	ZRSH 42 × 21 × 200
51 × 45	ZRSH 44 × 22 × 200
53 × 48	ZRSH 46 × 23 × 200
55 × 49	ZRSH 48 × 24 × 200
62 × 56	ZRSH 55 × 27 × 200
65 × 62	ZRSH 60 × 30 × 200
74 × 68	ZRSH 65 × 32 × 200
80 × 74	ZRSH 73 × 35 × 200
88 × 82	ZRSH 80 × 40 × 200

RF Impeders

If you have any problems with choice of standard sizes of ferrite cores and assembly impeders that are necessary for your application or with selection of materials for the casings, please contact us.