Aws Module 11.ppt

MODULE 11 – WELDING CODES AND SPECIFICATIONS

WELDING INSPECTION TECHNOLOGY

OBJECTIVE OF THE MODULE  TO CONSIDER THE ROLE OF CODES AND SPECIFICATIONS IN RESPECT TO WELDING INSPECTION AND THE ACTIVITIES OF WELDING INSPECTORS.

 TO REVIEW AND PRACTICE A METHOD OF FINDING INFORMATION AND APPLICABLE REQUIREMENTS FOR THE QUALITY OF WELDS AND WELDING.

FINDING CODE REFERENCE  IN WORKING WITH A CODE, IT IS A ESSENTIAL TO BECOME FAMILIAR WITH ITS STRUCTURE AND LAYOUT. HAS IT A DETAILED INDEX OR ONLY A TABLE OF CONTENTS? HOW ARE THE CONTENTS GROUPED AND WHAT DOES EACH SECTION, EXHIBIT, OR APPENDIX INCLUDE? THIS INFORMATION FORMS THE BASIS OF THE METHOD TO FIND THE

REQUIRED CODE REFERENCES.

 THE FIRST STEP IN FINDING CODE REFERENCE IS TO CONVERT THE INFORMATION SOUGHT INTO A QUESTION: FOR EXAMPLE:

 IS THIS WELDER QUALIFIED TO FILLET WELD T-JOINT IF THE ANGLE BETWEEN MEMBERS IS 45 DEG.?

 WHAT IS THE ALLOWABLE UNDERCUT FOR JOINT A?  WHAT IS THE MAXIMUM CONVEXITY FOR THIS FILLET WELD?

 THE SECOND STEP IS TO IDENTIFY IN THE QUESTION, THE KEY TERMS OR PHRASES LIKELY TO BE FOUND IN THE INDEX OR TABLE OF CONTENTS OF THE CODE IN USE. TAKING QUESTION #1 ABOVE, THE KET TERMS WOULD BE WELDER

QUALIFICATION, FOLLOWED BY FILLET WELD. SIGNIFICANT, BUT OF LOWER ORDER, MEMBERS AT 45 DEG. IN QUESTION #2 ABOVE, THE KEY TERMS ARE THE TYPE OF JOINT REPRESENTED BY JOINT A AND UNDERCUT. IN QUESTION #3 ABOVE, THE KEY TERMS ARE FILLET WELD AND MAXIMUM CONVEXITY.

 THE THIRD STEP IS TO SEARCH THE INDEX OR TABLE OF CONTENTS FOR THE KEY TERMS. REMEMBER, KEY TERMS SELECTED MAY NOT EXACTLY MATCH THE WORDS OF THE CODE INDEX OR TABLE OF CONTENTS. SO,

KEEP POSSIBLE ALTERNATIVES INMIND. FOR INSTANCE, IN AWS D1.1, THE TERM FIT-UP IS USED EXTENSIVELY IN THE TEXT BUT THERE ARE NO REFERENCES TO THIS TERM IN THE INDEX OR TABLE OF CONTENTS. THE TERM USED IS ASSEMBLY.

 THE FOURTH STEP IS TO FIND, AND CONFIRM, THE REFERENCE FOR COMPARISON WITH THE JOB ATTRIBUTES.

SAMPLE PROBLEMS  PROBLEM #1. FOR A PROCEDURE QUALIFICATION TEST TO BE PERFORMED, THE WELDING IS TO BE VERTICALLY UP. IN WHAT FIELD(S) WOULD THIS INFORMATION BE ENTERED?

 STEP

ACTION

1.

DATA ALREADY IN THE FORM OF A QUESTION.

2.

KEY TERM IS PROCEDURE QUALIFICATION AND SECONDARY TERMS ARE POSITION AND PROGRESSION.

3.

IN THE TABLE OF CONTENTS (OF SPEC B), WELDING PROCEDURE

QUALFICATION TEST RECORDS IS SHOWN AS BEING ON PAGE 1. ( APPENDIX I).

4.

TURNING TO PAGE 1, THE APPROPRIATE FORM IS SEEN. THE POSITION FIELD IS LOCATEDAS FIELD (4) AND THE PROGRESSION FIELD AS FIELD (13).

 PROBLEM #2. A GROOVE JOINT IS TO BE MADE USING JOINT DESIGNATION B-U2a BETWEEN MEMBERS AT 160 DEG. THE EDGES OF THE MEMBERS HAVE NOT BEEN CHAMFERED AND THE JOINT IS SET-UP FOR WELDING WITH A 7/16 in. GAP. WHAT ACTION, IF ANY, SHOULD THE WELDING TAKE?

 STEP

ACTION

1. WHAT ARE THE ANGLE AND THE FIT-UP TOLERANCES FOR PREQUALIFIED JOINT BU2a?

2. KEY TERM IS: PREQUALIFIED JOINT AND SECONDARY TERMS ARE JOINT BU2a, JOINT PREPARATION AND FIT-UP TOLERANCE. 3. FROM TABLE OF CONTENTS, PREQUALIFIED JOINTS ARE FOUND TO

BE ON PAGE 3-APPENDIX III. 4. IN APEENDIX III, JOINT BU2a IS FOUND IN THE LOWER DIAGRAM. THE DETAILS OF JOINT PREPARATION ARE GIVEN, ALONG WITH FIT-UP TOLERANCES. THIS CONFIRMS THAT THE REFERENCE FOUND IS APPLICABLE TO THE QUESTION.

 PROBLEM #3. A WELDER IS TO BE QUALIFIED ON 4 in. SCHEDULED 60 PIPE IN THE 2G POSITION. FOR WHAT OTHER GROOVE WELD POSITIONS WILL THIS WELDER BE QUALIFIED TO WELD IF ALL TESTS ARE PASSED SATISFACTORILY?

 ADOPTING THE METHODS OUTLINED ABOVE, APPROPRIATE INFORMATION WILL BE FOUND ON PAGES 11 AND 12 IN APPENDIX XI. LOOKING IN TABLE 2 OF THE APPENDIX HOWEVER, SHOWS THAT 4 in. SCHEDULED 60 PIPE IS NOT A SIZE USED FOR THE WELDING QUALIFICATION. THEREFORE, TESTS WITH THIS PIPE SIZE WOULD BE INVALID.