ISO 4386-1:2019
Plain bearings — Metallic multilayer plain bearings — Part 1: Non-destructive ultrasonic testing of bond of thickness greater than or equal to 0,5 mm
Plain bearings — Metallic multilayer plain bearings — Part 1: Non-destructive ultrasonic testing of bond of thickness greater than or equal to 0,5 mm
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 13
- Дата публикации:
- 16 апреля 2019 г.
- Издание:
- ISO IS 4386 edition 4 version 1
- ICS:
- 21.100.10
This document specifies an ultrasonic testing method for determining bond defects between the bearing metal and the backing. The test can be performed on metallic multilayer plain bearings consisting of steel- or copper-based material backings lined with bearing metal based on lead and tin, with layer thicknesses greater than or equal to 0,5 mm. For cast iron backings, this document is applicable with restrictions. The ultrasonic signal reflected by the bond interface between the bearing metal and the backing is used to determine bonding defects. Ultrasonic testing is not possible on edge zones of sliding surface, flange sides, joint areas, oil holes, grooves, etc. in a range of less than half the diameter of the ultrasonic probe because of undefined reflections. The same applies to bearings with dovetail keying grooves at the bond. Ultrasonic testing of bond does not apply along the edges of the dovetails. Evaluation of the bond on the visible transition from the backing to the bearing metal (on end faces or joint faces) is only practicable by the penetrant testing method specified in ISO 4386-3. This document only describes in detail the pulse-echo method. Within the meaning of this document, the ultrasonic method only permits a qualitative evaluation of the bonding and not a quantitative determination of the bond strength. The ultrasonic bond test differs only between bond and bond defect.
Abstract
Overview
ISO 4386-1:2019 specifies a non‑destructive ultrasonic testing (NDT) method for detecting bond defects in metallic multilayer plain bearings. It covers bearings with steel- or copper‑based backings lined with lead‑ or tin‑based bearing metal where the lining thickness is ≥ 0.5 mm. The document describes the pulse‑echo ultrasonic technique (qualitative only) to distinguish between a sound bond and a bond defect; it does not quantify bond strength.
Key topics and technical requirements
- Scope & materials: Applicable to steel- and copper-based backings; limited applicability to cast iron backings. Lining thickness ≥ 0.5 mm. Dovetail edges and small edge zones (within half the probe diameter) are excluded due to undefined reflections.
- Testing method: Pulse‑echo ultrasonic inspection using a rectified A‑scope display. The method relies on the ultrasonic signal reflected at the bond interface (bond echo and back‑wall echo).
- Equipment:
- Ultrasonic instrument with calibrated attenuator (dB) and adjustable time base.
- Normal‑beam probes sized to layer/backing thickness and material (typical diameters ~24 mm at 2 MHz down to 6 mm at 10 MHz). Dual‑element probes may be used for layer thickness
Технические детали
- Технический комитет
- ISO/TC 123/SC 2 - Materials and lubricants, their properties, characteristics, test methods and testing conditions
- SKU
- ISO 4386-1:2019
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