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`the
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`positive pole.Guide welding torch, the contained angle a who follows welding torch and
`work
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`piece vertical direction are 15, middle welding torch perpendicular to work piece.Guide
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`welding
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`torch, middle welding torch with follow the welding torch end-to-end arrangment, and
`be 8 with
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`the contained angle of work piece horizontal direcn'on and he 90.Distance between guide
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`welding
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`torch and the middle welding torch is 25mm, and middle welding torch and the distance
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`of
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`following between the welding torch are 25mm, and the speed of travel reaches
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`1.8mmin, and
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`obtainable weld width is 13mm.
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`The welding machine is the 500GR3 of Panasonic, and its process parameter
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`is: the
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`welding wire trade mark is MX-ZOOH, and the welding wire diameter is (D ]..2mm, and
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`the welding
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`voltage of three welding wires is 32V, and the welding current is 320V, does the
`extension and is
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`12mm, and the air mass flow is 15L/min, and the source of welding current is the work
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`piece and
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`connects the negative pole, and the welding torch connects the positive pole.Guide
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`