xix Chapter 37 Welder Certification .....................577 Codes and Specifications ................578 Employment Considerations ............584 Labor Unions ...................................584 Work Orders .....................................585 Appendices .................................590 Appendix A—Sample Welding Procedure Specification ................590 Appendix B—Sample Procedure Qualification Record .....................591 Appendix C—Sample Welder Performance Qualification Test Record ..................................593 Appendix D—Millimeter/Inch and Fraction/Decimal Equivalents .......594 Appendix E—Advantages/ Disadvantages of Various Welding Processes That Use Consumable Electrodes ...............595 Appendix F—Percent of Welding Filler Metal That Becomes Part of a Completed Weld Joint ...........596 Appendix G—Variables That Affect the Cost of Welding ......................597 Glossary ......................................598 Index ...........................................622