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E60 vs E70 welding electrodes

E60 vs E70 welding electrodes

E60 vs E70 welding electrodes

(OP)
Our specs for welding structural steel (buildings) have historically called for the use of E70 electrodes. Recently a contractor has requested the use of E60 for some A36 material citing "matching strength criteria". A little research reveals this is not a new concept. What are other firms doing? Any reason not to allow this with the appropriate check of the weld design?

RE: E60 vs E70 welding electrodes

We use E60 for galvanized steel welding. Have not used it for “matching” steel.

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RE: E60 vs E70 welding electrodes

If it has the required strength, and they have the proper weld procedures in place for the joint/electrode combination then structurally it is fine.

My concern would be consistency - is the entire job to be done with A36 steel and E60 electrodes? If higher strength steel/electrodes are required for other parts of the job then I would be inclined to say stick with the E70 everywhere so it doesn't get mixed up.

RE: E60 vs E70 welding electrodes

AWS D1.1 Table 3-1 gives compatible base metal/filler combinations. A36 up to 3/4" thick is a Group I metal that can be welded with E60XX electrodes. A36 over 3/4" thick is a Group II metal which can't be welded with E60XX electrodes. My AWS D1.1 is outdated and your specific project may not be using AWS D1.1.

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