Welding process and equipment for titanium plates and tubes
Pipeline cutting and groove processing;
Pipe cutting and beveling shall be performed by mechanical machining in a special place.During processing, clean water with non-polluted medium should be used for cooling to prevent oxidation.Processing tools should be special, and keep clean, to prevent iron pollution.The surface of the pipe shall be smooth and free of cracks, heavy leather and other defects.The maximum inclination deviation of the notch plane shall not exceed 1% of the pipe diameter.
use austenitic stainless steel wire brush to remove rust, paint, dirt, dust and sundries that can react with titanium on all welding surfaces and within 100mm of groove.Dressing the surface with grinding wheel to remove flash, burr, convex and concave defects.
Group pairs: align and clamp the titanium pipe and accessories, the axis shall not be offset, the clearance shall be uniform, and the titanium pipe shall be prevented from being damaged and polluted in the assembly.Avoid forcing pairs.Position welding adopts the same welding process as formal welding.
Degreasing: degreasing all welded surfaces and groove within 50mm with celluloid sponge coated with sulfur-free ethanol or sulfur-free acetone, leaving no residue on the surface
Welding equipment of titanium plate and titanium tube:
Welding machine: dc TiG welding machine.The welder shall ensure excellent working and adjusting characteristics and be equipped with sound ammeter and voltmeter.
Welding torch: QS - 75°/500 type water-cooled TiG welding torch.Welding torch should have the characteristics of simple structure, light and durable, gun body tight, good insulation, stable airflow, strong tungsten grip, suitable for welding in various positions.
Argon tube;Semi-rigid plastic pipe, not rubber hose and other hygroscopic materials.It shall be used exclusively and shall not be used in tandem with the pipe conveying other gases.The argon tube should not be too long, so as not to cause the flow instability caused by the pressure drop too large, generally no more than 30m.
Welding fixture: use austenitic stainless steel or copper tube karan, lock bolt and other groups of titanium plate and accessories.To ensure that the titanium plate and accessories have a certain clamping force, to ensure that the axis is consistent, evenly appropriate clearance.
Auxiliary equipment and tools: argon shield, polishing machine, special file, stainless steel wire brush, etc.