Multiple electrode submerged arc welding method
First Claim
1. A multiple electrode welding method which comprises:
- arranging a plurality of electrodes in such a manner that the distance is at least 300 mm between a first molten pool formed by multilayer welding by a single or a plurality of electrodes preceding along a weld line and a subsequent molten pool formed by a single subsequent electrode or plurality of subsequent electrodes;
forming slag having a composition which comprises;
TiO2 ;
20-65% by weightCaF2 ;
9.6-40% by weight, andAl2 O3 ;
10-56% by weighton weld metal formed by an electrode or a preceding electrode forming a preceding layer, andwelding along said weld line, without removing said slag, using said single subsequent electrode or said subsequent plurality of electrodes for forming said subsequent molten pool layer.
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Abstract
A submerged arc welding method and more specifically, a multiple electrode welding method is disclosed wherein welding is performed by arranging electrodes in such a manner that the distance becomes at least 300 mm between a first molten pool formed by multilayer welding or by a single or plural electrodes preceding along the weld line and a subsequent molten pool formed by a single subsequent electrode or plural subsequent electrodes, as well as a submerged arc welding method which is characterized in that there is formed a slag having the components listed below on the weld metal formed by an electrode or a preceding electrode forming a preceding layer, and welding is carried out as such, without removing the slag, using an electrode or a subsequent electrode forming a subsequent layer;
TiO2 : 20-65% by weight (up to 60% by weight, based on the total TiO2 amount, of which may be substituted by ZrO2);
CaF2 : 9.6-40% by weight, and
Al2 O3 : 10-56% by weight.
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Citations
11 Claims
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1. A multiple electrode welding method which comprises:
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arranging a plurality of electrodes in such a manner that the distance is at least 300 mm between a first molten pool formed by multilayer welding by a single or a plurality of electrodes preceding along a weld line and a subsequent molten pool formed by a single subsequent electrode or plurality of subsequent electrodes; forming slag having a composition which comprises; TiO2 ;
20-65% by weightCaF2 ;
9.6-40% by weight, andAl2 O3 ;
10-56% by weighton weld metal formed by an electrode or a preceding electrode forming a preceding layer, and welding along said weld line, without removing said slag, using said single subsequent electrode or said subsequent plurality of electrodes for forming said subsequent molten pool layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification