AS ISO 13916 pdf download

AS ISO 13916 pdf download.Welding—Measurement of preheating temperature, interpass temperature and preheat maintenance temperature
1 Scope
This document specifies requirements for the measurement of preheating temperature, interpass temperature and preheat maintenance temperature for fusion welding. This document can also be applied as appropriate in the case of other welding processes. This document does not cover the measurement of post weld heat treatment temperatures.
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. ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at http://www.iso.org/obp – IEC Electropedia: available at http://www.electropedia.org/ 3.1 preheating temperature 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 T; 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 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 ofA= 4x t, but not more than 50 mm, from the longitudinal edge of the groove (see Figure 1). This shall apply for workpieces thickness t not 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. W here 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.