AWS C7.3:2016 pdf download.Process Specification for Electron Beam Welding
4.2.3 Safety Data Sheets (SDS) shall be read by Welding Operator Maintenance personnel and all those involved in the maintenance process to determine hazards in working with all materials associated with the welding process.SDS shall be followed. These include the SDS for all cleaning solvents, materials contained in the workpiece, and fixturing.
4.3 X-Radiation. X-radiation is produced by electron beam welding equipment during operation. The system design incorporates shielding which reduces the radiation to allowable levels.
4.3.1 Proper shielding shall be employed to protect personnel from X-ray leakage.
4.3.2 Equipment shall be inspected and a radiation survey shall be conducted periodically to ensure that shielding is performing properly, as specified by the machine manufacturer.
4.3.3 All users of the equipment shall establish and adhere to a radiation safety program.
4.4 Visible Radiation. Direct viewing of the weld area during welding can expose personnel to visible, infrared, and ultraviolet radiation. Appropriate optical filters shall be used per ANSI Z87.1 to shield personnel from visible and ultraviolet light exposure.
4.5 Vacuum. All electron beam welding machines covered by this document use vacuum pumping to protect the beam during transmission and to prevent degrading of the workpiece.
The American Vacuum Society Vacuum Hazards Manual can be consulted for appropriate safety precautions when working with vacuum systems on electron beam welding equipment.
5.3.2 The tolerances for squareness and parallelism of the faying surfaces shall be specified in the reference document.Proper tolerances for these parameters are essential for the production of acceptable welds. See Clause 8 of AWS C7.1 for more information on acceptable tolerance levels for electron beam welding.
5.3.3 The tolerances for root opening and mismatch shall be specified in the reference document. Proper tolerances for these parameters are essential for the production of acceptable welds. See Clause 8 of AWS C7.1 for more information on acceptable tolerance levels for electron beam welding.
5.4 Preweld and Postweld Heat Treatments. Preweld and postweld heat treatments are material dependent. Postweld heat treatments are usually a separate operation. However, if either is used, essential parameters shall be specified in the reference document or WPS.
5.5 Procedures. All weldments shall be fabricated in accordance with the reference document by following the WPS qualified and accepted for each type of weld employed. Required records and documents include the WPS, the weld procedure qualification record (WPQR), and qualified procedures covering deviations from the above specifications such as weld rework or repair procedure specifications. Two categories of qualified welding procedures are referred to in this section: Procedures qualifed using (1) standard test weldments and (2) special test weldments.AWS C7.3 pdf download.