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FamiliArc LB-52U
KOBELCO - FamiliArc LB-52U
AWS A5.1 E7016, EN ISO 2560-A-E 42 B, JIS Z3211 E4316 (for root pass welding)
BabbittArc Welding Electrode
FamiliArc LB-52U is a low hydrogen type welding electrode which produces the innerside reinforcement of weld. In this welding, excellent weld metal and beautiful root ripple bead free from defects can be achieved by welding from one side of the joint. By this method, a welder can speed up the operation and yet get the good weld joint. LB-52U is often used for welding pipes and welding structures such as tanks, which can be welded only from one side.
General Characteristics
Workability
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LB-52U is much supenor in its ability of the root pass welding to the other low hydrogen type electrodes.
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Removability of the slag is good.
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This electrode makes beautiful root ripple bead if the manipulation of the electrode is suitable.
Manipulation of Electrode
If the following points area observed in using LB-52U, favorable weld without defects can be achieved.
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The first are strike should be done on the groove surface or tap plate.
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Put the electrode so deep that the protruding electrode coating might touuch the face of the joint.
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Keep the arc length as shorts as possible.
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During welding, a ket hole should be formed in front of the molten pool.
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Maintain key hole shape constant applying either semi weaving.
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For the first arc stopping without previous bead some kind of crater treatment should be done to prevet crater cracking.
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Arc re-start should be done on previous bead before moving to joining part.
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Subsequent arc stopping should be one on previous bead.
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