Titanium major diameter tube flow to ASTMB338 titanium tube has lightweight, high strength, and superior mechanical properties. It is widely used in heat exchange equipment, such as tubular heat exchangers, coil heat exchangers, serpentine tube heat exchangers, condensers, evaporators, transmission pipelines, etc. Many nuclear power industries use ASTMB338 titanium tubes as standard tubes for their units.

Size:0.8~10 thickness 6000mm length

Titanium pipe welding technology data: Titanium pipe welding is a TiG welding process that uses natural gas to effectively protect the welding area. Due to the special physical and chemical properties of titanium material, its welding process is quite different from other metals. 

(1) The metal in the welding zone is not polluted by active gas N, 0, H and harmful impurity elements C, Fe, and Mn above 250℃. 

(2) Coarse-grained structure cannot be formed. 

(3) Can not produce large welding residual stress and residual deformation. Therefore, the welding process must be in accordance with the predetermined construction sequence, strictly according to the process quality management standards, and the implementation of the whole process of quality control. The factors of human, machine, material, and method are in a good state of control, so as to ensure the welding quality of titanium tube within a reasonable period of time.

Titanium pipe welding materials, equipment, and tools

Titanium pipes and fittings: the factory's certificate of quality and quality certificate shall be provided. After re-inspection, its specifications, chemical composition, mechanical properties, and supply status should meet the requirements of the DIN17850 standard.

Titanium pipe welding material

Welding wire. The welding wire is erTI-2, and the welding wire should meet the following requirements:

(l) The chemical composition and mechanical properties of the welding wire should be equivalent to that of the base metal;

(2) If the weldment requires high plasticity, the welding wire with higher purity than the base metal should be used.

Argon: Industrial grade pure argon, purity not less than 99.98%, water content less than 50Mg/m3.

Before using argon, check the factory certificate on the bottle body to verify the purity index of argon, and then check whether the bottle valve leaks or fails. </ SPAN > Titanium pipe welding process is the use of the manual tungsten inert gas welding (GTAW) welding method in the atmosphere, before welding on the groove of titanium pipe and both sides of the internal and external surface within 25mm after the removal of oil, austenitic stainless steel wire brush, reamer and other mechanical methods to remove the oxide film, burr and surface defects. Cleaning tools should be dedicated and kept clean; The surface of the groove after mechanical cleaning and filling wire, before welding should be degreased with sulfur-free acetone or ethanol. In the welding process, special protective measures are adopted to make the parts of the titanium pipe welding area where the temperature may exceed 400℃ be partially or completely protected by argon gas, so as to achieve the purpose of titanium pipe welding.

Construction preparation → material acceptance → marking inspection → cutting and groove processing → groove peripheral treatment → weldment group pairing → welding → weld appearance inspection → weld P T and RT flaw detection → prefabricated pipe section hydrostatic test → drainage and drying → pipe opening closure transportation → on-site assembly.

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