The invention relates to a method for
welding thick plates of hollow
tungsten extremely
deep penetration TIG
welding, which comprises the following steps: step 1: fixing the workpiece to be welded on the
welding fixture; -1000A, starting arc current is 350-1100A, slightly higher than welding current,
cut-off current is 200-300A, starting time is 0.4-0.6s,
transition time is 0.5-0.8s, falling time is 2-3s, ionized gas The flow rate is 4‑6L / min, the
shielding gas flow rate is 15‑20L / min, the
gas supply time is 3‑5s in advance, the inner hole of the hollow
tungsten electrode is filled with
argon gas, the gas flow rate is 3‑5L / min, and the
shielding gas on the weld Both the
shielding gas and the lower shielding gas are
argon, the gas flow rate is 18-20L / min, the gas
delay after welding is 15-40s, the workpiece gap is 0.2-0.5mm, and the welding speed is 200-500mm / min; Step 3: Pass Press the welding preparation and welding start buttons on the welding
machine to start welding thick plates. The invention realizes the one-time penetration of the
thick plate, and ensures the high quality of the welding seam while realizing the high-speed welding of the
thick plate.