Except in very demanding circumstances, calibration of gas flow and gas bottle meters is not required since the amount of variation encountered does not normally influence weld quality.
The frequency of calibration is determined by the requirements of particular plants, but does not exceed approximately 12 monthly intervals.
The need for a definite policy for the calibration of welding equipment has been referred to the British Standards Institution for consideration.
Problems are often encountered with drying and baking ovens for electrodes, particularly at higher temperatures, above 300°C, when the temperature may be shown on the recorder but not achieved in electrodes. Failure to achieve the required temperature may also be a function of the way the electrodes are loaded into the oven (Fig. 13) since, if the layers of electrodes are too thick, heat may not reach to the centre of the bundle in the nominated time [18].
Except in very demanding circumstances, calibration of gas flow and gas bottle meters is not required since the amount of variation encountered does not normally influence weld quality.
The frequency of calibration is determined by the requirements of particular plants, but does not exceed approximately 12 monthly intervals.
The need for a definite policy for the calibration of welding equipment has been referred to the British Standards Institution for consideration.
Problems are often encountered with drying and baking ovens for electrodes, particularly at higher temperatures, above 300°C, when the temperature may be shown on the recorder but not achieved in electrodes. Failure to achieve the required temperature may also be a function of the way the electrodes are loaded into the oven (Fig. 13) since, if the layers of electrodes are too thick, heat may not reach to the centre of the bundle in the nominated time [18].
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