Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 34 other applications of the instruments. “Normal” ( standardised) procedures for calibration, verification and validation of the instruments may be too stringent and costly, if applied for welding purposes. Table 7 gives examples of the content of the standard, as relates to welding consumables. Designation Requirements Procedure Application of flux and filler metal, method, position, deposition rate, etc. Handling Temperature in storage cabinet/room Treatment prior to welding Instruments should be calibrated, verified or validated, as appropriate. Instruments used e.g. for control of storage conditions (temperature, humidity, etc.) should be calibrated, verified or validated. Instruments for temperature control, e.g. thermometers and other temperature indicators should be validated Instruments used for process control should be calibrated, verified or validated, as appropriate, depending on the nature of the treatment: drying, cleaning, etc. Requirements to measuring instruments such as weighing instruments, vernier callipers, rulers and straightedges, etc. are found in several EN, ISO and national standards. Stopwatches may be validated by comparison with any reasonably accurate clock. Requirements - 5 % for the instruments concerning humidity and + 5 °C for thermometer. Requirement max. +/- 5 °C. Appropriate standards for the procedure should be consulted. Table 7 – EN ISO 17662 requirements applicable to welding consumables Concerning welding processes parameters, EN ISO 17662 states that the requirement for calibration, verification and validation of instruments to measure arc welding parameters should be related to the ratio between deposited weld metal and total cross sections (a high ratio corresponding to a “cold” process and a low ratio to a “hot” process): welding processes/power sources, which permit significant variations of such a ratio, necessitate calibration, verification or validation, whenever the heat input control is required (see table 8). Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 35 Designation Requirements Procedure Electrical variables Current (mean)* Ammeters should be validated. Arc voltage (mean) 3 Voltmeters should be validated. Maximum width of the run or weaving amplitude when weaving is applied Travel speed Wire feed speed Weawing Frequency Dwell time of oscillation Torch, electrode and/or wire angle Instruments used for measuring should be calibrated, verified or validated, as appropriate. For Mechanised welding Measurements by means of stopwatches and rulers. Appropriate steel rulers need not to be calibrated, verified or validated provided the rulers are not visibly damaged. Measurements by means of stopwatches and rulers. Appropriate steel rulers need not to be calibrated, verified or validated provided the rulers are not visibly damaged. Calibration, verification or validation not required, provided size (penetration) and position of weld can be determined by non-destructive examination. Calibration, verification or validation not required, provided size (penetration) and position of weld can be determined by non-destructive examination. Instruments used for measuring should be calibrated, verified or validated, as appropriate. See ENV 50184. Mean value of (rectified) current. See ENV 50184. Mean value of (rectified) tension. Requirements to measuring instruments such as vernier callipers, micrometer callipers, etc. are found in several EN, ISO and national standards. Stopwatches may be validated by comparison with any reasonably accurate clock or watch. See also ENV 50184. Stopwatches may be validated by comparison with any reasonably accurate clock or watch. See also ENV 50184. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780 - - Requirements to measuring instruments such as vernier callipers, micrometer callipers, etc. are found in several EN, ISO and national standards. * The signal should be monitored continuously. The sampling time should be sufficient to give a reasonably stable reading. If tong-tests are used for measurement of current, the difference between mean value and RMS value measuring instruments has to be taken into consideration. Table 8 – EN ISO 17662 requirements applicable to welding parameters 2.14 Identification and traceability Identification of pieces and parts, and the possibility to retrace their position during the manufacturing stages and when delivered to the customer is one of the most effective way to achieve quality of the product and to have feedback about its functionality.
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Welding Fabrication Standards - EWF

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