ISO 10049-2019 pdf free.Aluminium alloy castings – Visual method for assessing porosity.
This document specifies a visual method for assessing the porosity of the machined surface of aluminium alloy castings.
The method does not apply to assessing porosity shown on radiograms.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Inspection requirements
The inspection requirements and acceptance criteria shall be clearly stated at the time of tendering and price enquiry, and specifically in the order sent to the founder and accepted by him or her.
Porosity is assessed on the machined surface of the casting, or one part of it, after total or partial machining as agreed between the parties concerned. The machined surface for inspection is thus a selected operating surface or a surface that has been machined only for reasons of inspection at a specific point on the casting, contiguous sample or hot top (see 5.1).
For each part of the casting to be inspected, the degree of severity shall be stated (see Figures 1 to 6).
The test is regarded as satisfactory if the indications of discontinuities obtained are of levels that are equal to or lower than those shown in Figures ito 6 and given in Clause 7.
Ifthis is not the case, the casting is either rejected, or it Is brought into conformity with the contractually agreed specification, by a method approved by the customer.
5.3 Lighting conditions
The porosity of the surface being inspected shall be assessed under good lighting conditions. The most suitable lighting is at an angle of 100 to 15° according to the quality of machining and in a direction opposite to that of the inspection. The assessment of the surface under diffused lighting conditions is not recommended.
5.4 Qualification of the operators
The tests shall be carried out and interpreted by technically competent operators, whose qualifications have been approved at the time of tendering and ordering.
6 Acceptance conditions
6.1 Image of discontinuities
By assessing porosity, the quality of the metallurgical treatment of the material and its macro- homogeneity can be evaluated.
Only the number of pores and their mean diameter on the surface are assessed. The depth of the pores is not determined.
6.2 Severity levels
For an assessment according to Figuresi. to fi, a frame with a 10 mm x 10 mm aperture is used. The number and size of the individual pores are determined on the surface within the aperture.
7 Interpretation of results
The examination shall be carried out on agreed areas of the surface of the casting, where the largest amount of pores is noted. The casting shall be considered as satisfactory if, in a window of 10 mm x 10 mm corresponding to the highest concentration of porosity in the agreed area, the level of porosity is less than or equal to that specified in the order.
Unless otherwise specified in the order, a degree of quality exceeding the specified level by one degree is permitted, provided that the area is less than 25 % of the total area under examination.
In all other cases, the casting shall be considered unsatisfactory.
The reference images are given only as a guide and the classification by a level of severity is based on the number and diameter of the pores, as shown in Figures 1 to.ISO 10049 pdf free download.