Tham khảo tài liệu 'advanced welding processes episode 2 part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Appendices 341 BS 639 Welding position 1 All positions 2 All except vertically down 3 Flat and horizontal 4 Flat 5 Flat vertically down HV fillets 9 Any combination not classified in 1-5 Current and polarity Digit DC AC 0 As recommended Not suitable by manufacturer 1 or- 50 minimum ocv 2 50 minimum ocv 3 50 minimum ocv 4 or- 70 minimum ocv 5 70 minimum ocv 6 70 minimum ocv 7 or- 80 minimum ocv 8 80 minimum ocv 9 80 minimum ocv Typical example The classification for an all positional basic with iron powder hydrogen-controlled electrode with a minimum UTS of 510 N mm-2 and yield strength over 450 N mm 2 and impact properties better than 28 J at -40 C and 47 J between -40 and -50 C would be E 51 5 5 BB 160 2 8 H 342 Advanced Welding Processes AWS Standard The AWS Standard is less complicated consisting of a prefix E followed by only two sets of digits E XXX Electrode Two or three digits indicating the tensile strength in 10 000 psi units. XX Two digits indicating the coating type and application as follows ExxlO Exxll Exxl2 Exxl3 Exxl4 Exxl5 Exxl6 Exxl8 Cellulosic DC ve. Deep penetration all position As Exx 10 but usable on AC Rutile ac dc flat and HV positions Rutile ac dc all positions Iron powder rutile high speed Basic low-hydrogen DC ve all positions Basic low-hydrogen ac dc all positions As Exxl6 with iron powder for improved recovery Exx20 Exx24 Mineral oxide silicate for flat and HV positions Similar to Exxl2 but with iron powder flat and HV Exx27 Exx28 As Exx20 but with iron powder Low-hydrogen basic with 50 iron powder flat and HV A suffix . Al B2 may be added to indicate the chemical composition of low-alloy-steel weld metal. The electrode classified above as E 51 5 5 BB 160 2 8 H would be classified as E7018 according to AWS . Appendix 3 Appendix 3a Burn of characteristics GMAW Plain carbon steel solid I solid solid .
