ISO 17683-2014 pdf free download

ISO 17683-2014 pdf free download.Ships and marine technology — Ceramic weld backing for marine use
Navires et technologie maritime — Soutien de soudures en céramique.
5 Dimensions and appearance
5.1 General
For inspection of its dimensions and appearance. six strips of ceramic weld backing shall be randomly
selected. Each one of the samples shall meet the requirements In 52 and £3.
5.2 Dimensions
5.2.1 The tolerance of thickness for ceramic weld backing block shall be ±0,5 mm of its thickness.
5.2.2 The length tolerance for a strip of ceramic weld backing shall be —10 mm to +20 mm of its length.
5.2.3 The centreline tolerance for ceramic weld backing block with moulding groove shall be ±1,0 mm.
5.2.4 The angle tolerances of a triangular or trapezoidal ceramic weld backing block shall be ±2°.
5.3 Appearance
5.3.1 Defects, such as damage and rounded corners, are not allowed for the joints between ceramic weld backing blocks other than rounded corners made by the mould itself.
5.3.2 Within the area of the groove of the ceramic weld backing blocks and 2 mm on either side of them, mould sticking grain shall not be larger than 0,5 mm and the defect of the pit and damages shall not be more than 0,5 mm on the surface of the ceramic weld backing blocks.
6 Performance and test
6.1 Moisture absorption rate
6.1.1 The moisture absorption rate shall be measured as follows.
a) Randomly select three samples among the ceramic weld backing blocks. The dust on their surface shall be blown clear. Lay the samples on a tray, then put into an oven of constant temperature and humidity together.
b) Switch on the power of the oven and adjust the humidity to (95 ± 3) % and the temperature to
(25±2)°C.
c) Keep the samples and tray in the oven for 4 h, then take the samples out of the oven, weigh all samples, and record the weights as mz separately with an accuracy of 0,001 g.
d) Lay the samples on the tray, then place into the oven of constant temperature. Switch on the power of the oven, adjust the temperature to 200 °C, and keep for 2 h.
e) Take the samples out of the oven and keep it in the dryer until it cools down to the room temperature. Weigh all samples by an analytical balance, and record the weights as mi separately with an accuracy of 0.001 g.
1) The moisture absorption rate for each sample shall be calculated in accordance with Formula (1).ISO 17683-2014 pdf free download.