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Due to this complex situation, it is possible that fabricators will be moving from EN Part 1 to ISO Part 1, or using the two in parallel, depending on the type of product being manufactured. This means it is necessary to fully understand each standard and the variations between the two.
This Job article will provide some insight into the differences between the standards. There are some differences between the two specifications with respect to the essential variables and their ranges of approval. An essential variable is a welding parameter or characteristic that, if changed outside its range of approval, requires the welder to be re-qualified. The relevant essential variables are listed in Table 1 for both specifications.
The differences between the two are highlighted in yellow. As EN Part 1 may still be used, a welder qualification may be carried out to EN and will remain valid as per that standard, until such time as the standard is withdrawn and the validity lapses. The test methods and acceptance standards are identical so it should be possible for the examining body to issue a new certificate taking account of any changes in the ranges of approval between the two specifications. With the existence of two welder qualifications, it is worth looking at the differences between the two.
Method c above is not included in EN The test methods now reference ISO specifications for visual examination, radiography, bend testing, fracture testing, macro-examination, and ultrasonic testing. Related Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:. You are commenting using your WordPress. You are commenting using your Google account.
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Notify me of new posts via email. The requirements in ISO Pt 1 are now similar to those in ASME IX in that, for example, a welder may be qualified to weld stainless steel by using a stainless consumable on a carbon steel test piece. The only departure from this is for autogenous welds where the range of approval is that of the parent metal group. The filler metal composition has become an essential variable.
Similar compositions are grouped together as FM1, non-alloy and fine-grained steels; FM2, high strength steels etc. In addition to the groups covering the steel compositions, there is a group FM6, nickel and nickel alloys. Note that ISO Pt1 is to qualify welders for the welding of steels so this group does NOT qualify the welder to weld nickel-based alloys but is intended for applications such as dissimilar metal joints between low alloy and austenitic stainless steels.
The range of approval on thickness for butt welds is now based on the deposited weld metal thickness. The parent metal thickness is still the essential variables for fillet welds. The validity of the welder certificate must be confirmed at six-monthly periods by the manufacturer according to both standards.
According to ISO Clause 9. Like this: Like Loading Leave a Reply Cancel reply Enter your comment here Email required Address never made public. Name required. Next Next post: Heat input vs Arc energy in welding.
In ISO the qualified thickness of a butt weld is the deposit thickness. ISO includes 6 separate filler metal groups — see Table 2 and Table 3. In ISO filler additions qualify for autogenous but not vice versa.
ISO has added submerged arc welding to the qualified processes. In ISO dip transfer qualifies spray but not vice versa — process , , Method of revalidation must be stated on the certificate at time of the initial test.
Due to this complex situation, it is possible that fabricators will be moving from EN Part 1 to ISO Part 1, or using the two in parallel, depending on the type of product being manufactured. This means it is necessary to fully understand each standard and the variations between the two. This Job article will provide some insight into the differences between the standards. There are some differences between the two specifications with respect to the essential variables and their ranges of approval.
Welder Qualification Procedures and Training
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BS EN 287-1:2011
BS EN is a European Standard that defines the qualification testing of welders for the fusion welding of steels. It covers fusion-welding processes which are designated as manual or partly mechanized welding. It does not cover fully mechanized and automated welding processes see EN Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents.