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发表于 2007-12-20 23:41
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来自： 中国辽宁葫芦岛
no 47 shiupbuilding and repair quality standard
part b shipbuilding and repair quality standard for existing ships
5 general requirement s to welding
5.3 dry welding on hull plating below the waterline of vessels afloat
5.3.1. Welding on hull plating below the waterline of vessels afloat is acceptable only on normal and higher
strength steels with specified yield strength not exceeding 355 MPa and only for local repairs. Welding involving
other high strength steels or more extensive repairs against water backing is subject to special consideration and
approval by the Classification Society of the welding procedure.
5.3.2. Low-hydrogen electrodes or welding processes are to be used when welding on hull plating against water
backing. Coated low-hydrogen electrodes used for manual metal arc welding should be properly conditioned to
ensure a minimum of moisture content.
5.3.3 In order to ensure dryness and to reduce the cooling rate, the structure is to be preheated by a torch or
similar prior to welding, to a temperature of minimum 5oC or as specified in the welding procedure.
ALL of THOSE IS OK. |
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楼主: rxg2001
