S9074-AQ-GIB-010/248 Rev 1
Table 7-5. Essential Elements of a Welding Procedure 12/ - Continued
Arc Welding 1/
Fuel Gas Welding
Robotic, Automatic, and Mechanized 3/
Manual
Semi-Automatic
Torch position (relative off-set from vertical center- line in horizontal-rolled position) Electrode lead or trail angle (wire feed angle)
--
--
X
--
--
--
X
--
Gas cup size
X (GTAW only)
X
X
--
NOTES:
1/ The following shall also be specified as essential elements:
(a) Details of current slope, if used. (b) For the gas tungsten arc process:
(1) Detailed description of pulsed welding current, if used, including all pulsed current and voltage parameters that can be varied by adjustment of pulsed power supply controls; manufacturer and model number of pulsed power supply. (2) Tungsten electrode diameter and type. Where applicable, see footnote 11. (c) For the gas metal arc process, a description of pulsed welding, if used, including current and average voltage and, if welding equipment permits monitoring and independent control, peak pulse voltage and pulse frequency. Where applicable, see footnote 11. (d) For semi-automatic welding, filler metal feed rate, except when feed rate is controlled by amperage and amperage is set by the welder. (e) Trade name (i.e., manufacturer and manufacturer’s designation) and generic description of ceramic or non -metallic backing material, if used. (f) For hot wire feed, the hot wire amperage and voltage. (g) For robotic, automatic, and mechanized welding: (1) Filler material feed rate; (2) Type of arc length or voltage control; (3) For gas metal arc and flux-cored arc, the gas cup to work distance and contact tube to work distance; and (4) For submerged arc welding, the contact tube to work distance. (h) For welds in S-51, S-52, S-53, and S-53A materials: (1) Trailing shield description (including materials); (2) Shielding gas or mixture; (3) Minimum purity and dew point(s) of shielding gas(es); and (4) Flow rates in torch, trailing, and backing shields. (i) For S-51, S-52, S-53, and S-53A materials, a statement of workmanship standards including welding environment, material (filler wire, tools, etc.) storage and handling, and in-process quality control. (j) For weld cladding and hardfacing procedures, all parameters corresponding to each of the items of 4-7.9 and 4-8.p and weld bead overlap. For manual and semi-automatic welding, deposition technique (stringer or dimensioned weaving) shall also be specified. Any essential element that differs from one layer to another shall be specified on a per-layer basis; also see figure 7-4, note 5(c) if dilution testing is used for qualification. (k) For plasma arc welding, (1) plasma arc gas flow rate and composition; (2) powder metal feed gas flow rate and composition; (3) arc type (i.e., transferrable or nontransferable); (4) diameter of arc constricting orifice; (5) type and model of welding equipment; (6) type and size of electrode; (7) for robotic, automatic, and mechanized welding, electrode spacing; (8) powder metal size; and (9) description of keyhole technique when employed. (l) For procedures involving S-44 materials, all parameters corresponding to each item of 4-7.8.f and 4-8.p shall also be considered essential elements specified in the welding procedure when applicable. 2/ Except for arc voltage.
(Footnotes continued on next page.)
7-44
Made with FlippingBook - Share PDF online