| 摘要 |
PROBLEM TO BE SOLVED: To provide a contact tip with an iron core which dose not conduct electricity through the contact tip and can reduce abrasion of a hole at the tip of the contact tip and prevent displacement of welding bead by inserting the iron core instead of copper into the center hole of the conventional contact tip. SOLUTION: A nonconductive metal or ceramic (1) is inserted into a contact tip (2). COPYRIGHT: (C)2003,JPO
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