AWS D1 1 2020 Code for Welding of Steel Structures

Mondo Social Updated on 2024-01-29

Welding Process Qualification Concept

Welding process qualification is the preliminary preparation for the whole welding work. The welding process qualification work is the test process and result evaluation to verify the correctness of the welding process of the proposed weldment and related products.

It includes the process of pre-weld preparation, welding, testing and evaluation of its results. Welding process qualification is also an important process in production practice, which has premises, purposes, results and limits.

American Welding Society Standard AWS D11/d1.1m: 2020 - Code for Welding of Steel Structures 24th Edition was approved by the National Bureau of Standards in December 2019 and replaced the 2015 version of the standard. Since the new version of the standard has changed a lot compared to the 2015 version, it may have brought a huge shock to many users.

The most obvious change is in its organizational structure, which is intended to make the standards more rationally ranked and in line with the order of other AWS standards structures. To achieve this, a number of editorial changes have been made to the standard, including moving the basic information in the appendix to the front of the specification, setting the reference standard in Article 2, and setting up the terms and definitions in Article 3. In order to unify the format of the structural welding code, each clause begins with a scope and is subsequently divided into sections, making it easier for readers to understand and use.

This change results in a change in the position of the provisions of Article 1 – General Requirements in the 2020 version compared to the 2015 version: from design to bolt welding, i.e. clauses 2 to 7 of the 2015 version were changed to clauses 4 to 9 in the 2020 version. Article 9 in the 2015 version: The content of tubular structures was moved to article 10 in the 2020 version.

Article 8 in the 2015 version: Reinforcement and repair of structures was moved to Article 11 in the 2020 version.

The alphabetic order in the Appendix has also changed with the Reference Standards, Definitions, and Appendix A: Effective Weld Thickness for Fillet Welds moved to the 2020 version, respectively. The preamble in the 2020 version of the specification starts on page xiii, which provides a signpost for new location queries for the various articles in the 2020 specification.

In addition to the above changes, the 2020 version of the specification has made the following specific editorial and substantive changes:

Clause 4: Design – Setup Figure 41. The effective weld thickness diagram of fillet weld in Appendix A of the 2015 edition has been moved here.

Clause 5: Waiver WPS, reorganized to make the content more logical, and contractors should bear the brunt of the written waiver WPs. This change results in a change in the content terms, ** and icon numbering. d1.1/d1.1m: Table 3 in 20157 The WPS variables exempted from assessment have been changed to Table 5 in the 2020 version2. And the name was changed to "WPS basic variables exempted from assessment", and the range of variables has also been listed separately.

Substantive changes to Article 5 include:

In Table 53: New material has been added to the approved WPS base metal that is exempt from assessment.

Add a new table 57: GMAW is AWS A518/a5.The 18M electrode is an optional shielding gas in WPS that can be exempted from rating.

Article 6: Assessment.

Added requirements for WPS evaluation to use waveform control processes;

Added an explanation of the various methods used to evaluate PJP welds;

New provisions have been added to the WPS assessment with Charpy impact toughness (CVN) requirements, including CVN specimen positions, and the CVN test requirements have been increased to Table 66 in.

Clause 7 – Manufacturing: Amendments have been made to the use of welding methods to repair base metals where holes are incorrectly positioned.

Article 8 – Inspection: Amendments have been made to the qualifications of welding inspectors and the responsibilities of engineers in relation to inspection, digital radiography, digital unclarity, and determination of attenuation factors for ultrasonic testing.

Clause 9 – Stud Welding: New requirements for the identification mark of the manufacturer of the stud head and deformed reinforcing bar, re-specifying the selection of stud fillet welds by the contractor.

Clause 10 – Tubular Structures: The requirement for the calculation of the static load strength of welded tubular structures has been removed and ANSI AISC 360 and AISC Design Guide Part 24 have been designated as reference documents for designers.

d1.1/d1.1m: 2015, phased array ultrasonic testing technology has been added to the bridge welding specification, and this testing technology is also included in the new version of the standard, and the use requirements and new notes have been added in Appendix H.

Appendix R contains revised pre-design provisions for circular pipe connections, which in the 2015 version is in the tubular structure clause.

aws d1.1: 2020 welding process qualification and welding personnel certification process.

1.Confirmation of customer information and evaluation contents

2.Reach a technical service agreement;

3.The customer prepares the test board, PWPS WPS;

4.CWI witnesses and records the welding process on site

5.Laboratory inspection or on-site inspection of welding specimens;

6.After passing the inspection, the welding process qualification report and the welding personnel examination certificate agreed in the technical service agreement will be issued

7.Certificate extensions, recertifications, ongoing service.

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