BACK SHIELDING METHOD OF MELT WELDING

PURPOSE:To prevent cold cracking of welded metal in melt welding that uses a nonconsumable electrode or a consumable electrode, by heating back shielding gas to specified temperature before supplying. CONSTITUTION:When performing TIG welding or MIG welding, a sample 8 to be welded is put between the...

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Bibliographische Detailangaben
Hauptverfasser:	OOSAKI KEIJI, NAGATA TADASHI, KANESASHI HISAYOSHI, NAKANISHI REN
Format:	Patent
Sprache:	eng
Schlagworte:	CLADDING OR PLATING BY SOLDERING OR WELDING CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SOLDERING OR UNSOLDERING TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent cold cracking of welded metal in melt welding that uses a nonconsumable electrode or a consumable electrode, by heating back shielding gas to specified temperature before supplying. CONSTITUTION:When performing TIG welding or MIG welding, a sample 8 to be welded is put between the lower plate 6 and pressing plate 7 of a constraining jig and fixed with a constraining jig and fixed with a constraining bolt 9. Unheated Ar gas is supplied from an Ar gas cylinder 1 for arc shielding to a torch 5. On the other hand, shielding gas from an Ar gas cylinder 2 for back shielding is heated by a heating furnace 12, and supplied from a hole 10 of the lower plate 6 through a copper pipe 11. At this time, temperature of back shielding gas is measured by a thermocouple 13 and recorded by a recorder 14 and supplied so that back shielding gas can be heated to above transition point of impact value determined by composition of metal to be welded, and below 200 deg.C.