BS EN 1371-2:2015 pdf free

BS EN 1371-2:2015 pdf free.Founding – Liquid penetrant testing Part 2: Investment castings.
4 Method of testing
4.1 Operating mode
Testing shall be carried out as described in EN ISO 3452-1, EN ISO 3452-2, EN ISO 3452-5 and EN ISO 3452-6. The characteristics of the penetrant materials shall be checked in accordance with specifications to be agreed between the manufacturer and the purchaser.
4.2 Qualification of the operators
Testing shall be performed by qualified personnel. The level of qualification shall be agreed between the contracting parties (e.g. EN ISO 9712, or EN 4179, or a similar certification scheme).
4.3 Surface preparation
The surface to be inspected shall be clean, free from rust, scale, moulding residues, oil, grease, paint or any other contaminant which can interfere with a correct testing. The surface to inspect shall be cleaned by using mechanical or chemical methods, or a combination of these.
Shot blasting is not recommended prior to liquid penetrant testing. If shot blasting is necessary, it shall be as light as possible, in order to avoid sealing or dosing up possible discontinuities. If the risk of sealing or dosing up possible discontinuities is unacceptable then blasting shall be followed by chemical etching in order to enable detection of discontinuities. The chemical composition of the etching bath and other parameters such as concentration, temperature, immersion time neutralizing and rinsing, if applicable, shall be recorded.
To detect the smallest indication to be considered, the surface finish shall be in accordance with Table 3, unless otherwise specified at the time of ordering.
The assessment of surface finish should be carried Out using a visual cast-surface roughness comparator:
see EN 1370.
4.4 Viewing conditions
The examination of the indications shall be carried out with the naked eye or at a minimum magnification of 3
and viewing conditions in conformity with EN ISO 3059.
5 Acceptance criteria
5.1 Indications of discontinuities
5.1.1 General
The indication of discontinuities can be non-linear (isolated or clustered), aligned or linear. Although liquid penetrant testing cannot generally be used to determine the size of detected discontinuities, it allows discontinuities to be assessed by measurement of the length L of the indication. In the following clauses:
— L indicates length;
— indicates width;
— P indicates liquid penetrant.BS EN 1371-2 pdf download.