Iso 15614-1 Pdf 2019

[Nella Mcnairy]

ISO15614-1:2017 defines the conditions for the execution of welding procedure tests and the range of qualification for welding procedures for all practical welding operations within the qualification of this document.

The primary purpose of welding procedure qualification is to demonstrate that the joining process proposed for construction is capable of producing joints having the required mechanical properties for the intended application.

Two levels of welding procedure tests are given in order to permit application to a wide range of welded fabrication. They are designated by levels 1 and 2. In level 2, the extent of testing is greater and the ranges of qualification are more restrictive than in level 1.

Specification and qualification of welding procedures that were made in accordance with previous editions of this document may be used for any application for which the current edition is specified. In this case, the ranges of qualification of previous editions remain applicable.

It is also possible to create a new WPQR (welding procedure qualification record) range of qualification according to this edition based on the existing qualified WPQR, provided the technical intent of the testing requirements of this document has been satisfied. Where additional tests have to be carried out to make the qualification technically equivalent, it is only necessary to perform the additional test on a test piece.

Amendments are issued when it is found that new material may need to be added to an existing standardization document. They may also include editorial or technical corrections to be applied to the existing document.

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The first qualification range you get is the levels themselves. If you qualify a WPQR in Level 2, you are qualified to work in Level 1 projects, but the other way around is not possible. A Level 1 WPQR will not allow you to work in Level 2 projects.

For Level 1 PQRs, if you are used to work with ASME IX you will recognize these values. The list is the same. As for Level 2, there is a significant change for companies that do thin plates/pipes (less than 3 mm).

Approval range values remain unchanged for the Fillet Welds with the exception of a small note that says: In case of different material thicknesses, the range of qualification of both thicknesses of the test pieces shall be calculated separately.

Another significant change on this standard. In the previous version the preheating temperature from the test piece would become the minimum approval range. In ISO 15614-1 (2017) a 50C decrease is now possible on the written WPS.

These are the main changes on ISO 15614-1 from the previous version. Everything that is related to Level 1 PQRs is completely new, so I would recommend you would verify these yourself. They are a bit extensive but ISO 15614-1 is a lot clearer than the previous revisions.

The 2017 version of the standard is the result of an extensive and lengthy revision process completed by the ISO /TC 44/SC 10 subcommittee and differs significantly from the previous version in format, with some major changes in technical content. This article presents the most significant differences between the 2017 and the previous version of the standards, explains the rationale behind the changes and provides practical guidance on how to deal with them.

DISCLAIMER - TWI is not authorised to give official interpretations of BS EN ISO standards. The views and opinions expressed in this article are those of the authors and do not reflect the official policy or position of ISO, CEN or BSI. This article is not to be taken as a substitute for the standard, which must be consulted where its application is required. No liability rests with TWI for any damages arising from the content of this article.

The main change is that ISO 15614-1:2017 includes two levels of welding procedure tests, designated by levels 1 and 2. Level 1 is based on requirements of Section IX of the ASME Boiler and Pressure Vessel Code (ASME IX) and Level 2 is based on the previous issues of ISO 15614-1.

As explained in the UK National Foreword to BS EN ISO 15614-1:2017, during the development of this standard, the UK committee voted against its approval. The UK committee was concerned that the format of the standard (two levels being presented side-by-side, mixed with text common to both levels) may cause a problem when working to either of the two welding procedure test levels. Users are warned that, as the requirements of the two levels are often specified in the same clause, vigilance is required to identify the testing requirements and the range of qualification for the particular welding procedure test level.

A description of the main technical changes is given in the table below. This also includes an explanation of the rationale behind the changes and how these affect existing and future welding procedure qualifications.

The welding direction is now from the bottom to the top of page, but the specimen location is the same. So, the location of test specimen with regard to the start and end of the weld has changed (see below).

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Usually this involves having stacks of paper files with all the documents inside. Even if you have them organized by metals, welding process, or certificate number, going through these files is not an easy task.

What really becomes difficult is when you have to work under product standards such as ASME B31.3, EN 1090-2, or with specific contract requirements, and you have to add some non-essential variables to the whole mix.

One specific detail that caught me off-guard was when our welding specification for a project under EN 13480 included a WPS / PQR with charpy-V notch tests that only reached 35J on a stainless steel at -196C (ISO 15614-1 only requires 27J minimum, but EN 13480 states that stainless steels require a minimum of 40J, regardless of the temperature they will be operating).

This was with TIG and MMA welding processes, and it meant either requalifying this procedure or use the ones with TIG only. Eventually it was decided that no further procedures would be qualified, which led to a productivity loss.

In the end, we were caught off-guard by a small detail in our tools for managing our certifications, which is why you should store as many variables in your system as possible. My recommendation for a basic system would be to keep track of the following PQR variables:

The new welding procedure test standard, EN-ISO 15614-1:2017, provides recommendations for the measurement and calculation of heat input. In concrete terms, what does this mean for MIG/MAG welding? And how can workshops carry out these calculations in practice?

The new welding procedure test standard refers to the technical reports for ISO/TR 18491 and 17671-1, which state that arc voltage must be measured as close to the arc as possible. This way, voltage losses caused by welding cables can be eliminated. Table 1 presents the recommended measurement points for various welding processes.

Formulae A, B, and C are suitable for non-waveform-controlled welding methods. Only formulae B and C may be used for calculations related to waveform-controlled welding methods. Instantaneous energy or power must be measured with an external meter if the welding machine does not display it. In both cases, the sampling frequency must be no less than 10 times the waveform frequency.

To determine heat input, we must first calculate the arc energy and multiply it by the thermal efficiency. Below, we provide an example of the calculation of arc energy (E) and heat input (Q) in MIG/MAG welding. Such calculations that use averages for the current and the voltage are applicable only for non-waveform-controlled welding:

The welding parameters from the power source are 500 A and 39 V (19.5 kW). Voltage loss is 9.55 V, and power loss is 4.8 kW. This shows that the voltage losses are at their greatest when long and thin welding cables and high welding currents are used.

The definition of waveform-controlled welding is not clear-cut, and that may give rise to differing interpretations. Because of this, we carried out practical welding tests to measure the effective and calculated power (averages were used for the current and the voltage in these calculations).

Table 6 presents the results from the MAG welding tests, which show an error value of 12.8% at the lowest measured value (59 A). As the power is increased, the error decreases, and it is no longer significant at currents exceeding 200 A.

This feature makes jobs such as filling in Welding Procedure Qualification Records easier since the required information on welding parameters, welding speed, and heat input is automatically generated by the X8 Control Pad unit after welding.

So what is the take-home message here? From the perspective of heat input calculations, voltage measurements should be carried out as close to the arc as possible because of voltage losses caused by welding cables. At least in pulsed-MAG welding, the effective power should be used in the calculations, because some level of error occurs across the whole power range.

However, performing calculations with pen and paper is a thing of the past, because the latest MIG/MAG machines make life a little bit easier for welding engineers, offering accurate automated calculation of heat input.

Welding Value is a corporate blog hosted by Kemppi Oy. We want to evoke discussion on the transformation of modern welding, and bring you the latest stories from within the global welding industry told by true experts.

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