tailieunhanh - Advanced Welding Processes Episode 2 Part 1

Tham khảo tài liệu 'advanced welding processes episode 2 part 1', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 234 Advanced Welding Processes also be required to qualify a named welder to carry out a specific procedure. c Procedure management Management of welding procedures using this technique involves maintenance of procedure specification and qualification records calibration of welding and ancillary equipment and monitoring compliance with the specified procedure. Maintaining procedure records. Having established a satisfactory procedure and obtained procedure qualification it is necessary to maintain a record of the parameters and techniques used and to control the issue of this information to the shop floor to enable consistent joint quality to be achieved. In many cases this information will be required on an irregular basis particularly when small batches of fabrications are required. The welding procedure specification records will also be required when tendering for new projects when preparing procedures for new work or when analysing production problems. A fabricator will quickly generate a large library of procedures and it is necessary to devise a suitable system for storage and retrieval. Many companies are now using computer database systems for procedure management in order to reduce duplication and improve access to procedure data 175 . Validity of parameters and calibration of equipment. The validity of the procedure will depend on the possibility of establishing the same operating conditions when the process is used with the stated parameters by a different operator in a different workplace using equipment and consumables of the specified type. If the parameters specified are ambiguous or ill-defined the resultant weld may well be inferior to those prepared at the procedure development stage. For example in GMA welding when voltage is used as a control parameter the voltage reported should be the arc voltage measured as near to the arc as possible. Open circuit or no-load values may be easier to measure but are meaningless unless the static .