By R Boekholt
This file includes info from greater than sixty shipyards from worldwide, and offers a different stock of different points of welding mechanization and automation utilized in construction huge, heart and small-sized ships. Shipbuilders, marine engineers and exchange companies will welcome and cost this targeted selection of facts, assembled for the 1st time in any such entire structure, and interpreted by way of the writer into tendencies for the long run operation of the undefined.
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Extra resources for Welding mechanisation and automation in shipbuilding worldwide: Production methods and trends based on yard capacity
Sample text
Welding speed is about 90 cm/min. This is the last operation on the panel h e . 3 Block assembly Str;lleht-shioblocks (m le double bottom) Buildmg starts on tank top by fitting longitudinal and transverse webs. Welding of fillet welds is manly done by FCAW for vertical down position. The 2F position is carried out using high efficiency electrodes. The company is switching to FCAW. ) Wire feeders are suspended on gantries. Bottom plating is fitted in the overhead position (tack welding by electrode).
Tandem welding is used if possible. Limits for the process are plate thickness and steel quahty (LPG, stainless). Before fitting of the stiffeners local sandblasting is applied. Welding of the fillet welds is by a SAW twin-arc double head tractor. Welding speed is about 90 cm/min. This is the last operation on the panel h e . 3 Block assembly Str;lleht-shioblocks (m le double bottom) Buildmg starts on tank top by fitting longitudinal and transverse webs. Welding of fillet welds is manly done by FCAW for vertical down position.
The company is switching to FCAW. ) Wire feeders are suspended on gantries. Bottom plating is fitted in the overhead position (tack welding by electrode). Block is tumed over for welding in flat position. Welding is carried out by high efficiency electrodes (2F). Curved bl& Block is positioned in optimal welding position in ‘pin bedding’. If possible two sided SAW is used, if not, FCAW is used. 2 mm rude type). Primer is not a problem. Grand block assemblv 1uo to 450 tons can be built insidd Used for prefitting bigger units (car-ferry) or for spreading the work.