AS ISO 13916:2018 pdf free.Welding-Measurement of preheating temperature, interpass temperature and preheat maintenance temperature.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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3.1 preheating temperature T temperature of the workpiece in the weld zone immediately prior to any welding operation
Note 1 to entry: It is normally expressed as a minimum and is usually equal to the minimum interpass temperature.
3.2 interpass temperature T1 temperature in a multi-run weld and adjacent parent metal immediately prior to the application of the next run
Note 1 to entry: It is normally expressed as a maximum temperature.
3.3 preheat maintenance temperature Tm minimum temperature in the weld zone which to be maintained if welding is interrupted
4 Requirements
4.1 Point of measurement
The temperature measurement shall normally be made on the surface of the workpiece facing the welder, at a distance of A = 4 x , but not more than 50 mm, from the longitudinal edge of the groove (see Figure 1). This shall apply for workpieces thickness tnot exceeding 50 mm in the weld.
When the thickness exceeds 50 mm, the required temperature shall exist in the parent metal for a distance of minimum 75 mm or as otherwise agreed in any direction from the joint preparation. Where practicable, the temperature shall be measured on the face opposite to that being heated. Otherwise,the temperature shall be confirmed on the heated face at a time after removal of the heat source related to parent metal thickness to allow for temperature equalization. Where fixed permanent heaters are in use and there is no access to the reverse face for temperature measurement, readings shall be taken on
the exposed parent metal surface immediately adjacent to the weld preparation. The time allowed for the temperature equalization shall be of the order of 2 min for each 25 mm of parent metal thickness. Interpass temperature shall be measured on the weld metal or the immediately adjacent parent metal.AS ISO 13916 pdf donwload.