Titanium pipe welding process of seawater lift pump system
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A seawater lift pump and welding process technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problems of high difficulty, high requirements for welding process control, and easy generation of air holes, etc., and achieve great economic benefits and Social benefits, high-quality welding effects, and effects of avoiding air holes
Inactive Publication Date: 2014-10-08
CSSC GUANGZHOU WENCHONG DOCKYARD CO LTD
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However, due to the fast melting and absorption of oxygen, nitrogen, hydrogen, and carbon in the welding process of titanium alloy (titanium absorbs hydrogen above 250°C, absorbs oxygen above 400°C, and absorbs nitrogen above 600°C), the strength and hardness of the alloy increase. The plasticity and toughness are reduced, and the weld is prone to brittle fracture; in addition, pores are easily generated during the welding process, and the pores have a large adverse effect on plasticity, fracture toughness, impact toughness and fatigue strength. At the same time, there are also oxidation, Defects such as impurities, these problems have brought a certain degree of difficulty to welding
The welding process control requires high requirements and great difficulty, which makes it difficult to meet the welding quality requirements
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Embodiment 1
[0026] The titanium pipe welding process of the seawater lift pump system in this embodiment is characterized in that it includes the following steps:
[0027] (1) Choose a closed welding environment, the welding environment is clean and independent, the humidity of the air does not exceed 60%, the temperature is not lower than 15 ℃, and the influence of other air currents must be avoided during the welding process.
[0028] (2) Before the titanium tube is assembled, use a clean lint-free cloth with acetone to wipe off all scale, slag, oxides or other foreign metals on and near the weld, and titanium within 100mm of the weld ends. The inside and outside of the pipe are cleaned with acetone, and the welding wire to be used is also cleaned in the same way. During the above cleaning process, the operator wears white cotton gloves, and it is forbidden to directly touch the pipe fittings and welding materials with hands.
[0029] (3) Titanium tubes are butted with V-shaped grooves ...
Embodiment 2
[0037] The titanium tube welded in Example 1 (specification ф60.3×5.54mm, grade B861Gr.2) was tested for mechanical properties. The ambient temperature of the test was 24°C. The results are shown in Table 2 below:
[0038] Table 2 Test results of mechanical properties of welded titanium tubes
[0039]
[0040]Taking ASME as the testing standard, the above mechanical performance tests are qualified.
Embodiment 3
[0042] The titanium tube welded in Example 1 (specification ф60.3×5.54mm, brand B861Gr.2) was tested for mechanical properties. The ambient temperature of the test was 25°C. The hardness (HV10) of the test results is shown in Table 3:
[0043] Table 3 Hardness test results of welded titanium tubes
[0044]
[0045] With ASME as the testing standard, the above hardness test is qualified.
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Abstract
The invention relates to a titanium pipe welding process of a seawater lift pump system. The titanium pipe welding process comprises the following steps of step 1, selecting the closed welding environment; step 2, cleaning welds of a titanium pipe and welding wires to be utilized through the acetone before the titanium pipe is assembled; step 3, performing the equal wall thickness V-shaped groove abutting joint on the titanium pipe, performing alignment on a pipeline and adopting a grinding or machining mode during groove machining, wherein the angle of a groove is 50 to 70 degrees, a root gap is 2 to 4 mm, and the blunt edge is 0 to 1 mm; step 4, implementing back side protection and drag covert protection after the assembly is achieved, wherein the 99.999% high-purity canned argon gas is selected to serve as the protection gas and the pressure is not less than 25 bar; step 5, performing welding in a two-person piecewise symmetric welding mode; step 6, performing arc blow-out and performing continuous protection through the protection gas until the surface temperature drops to below 100 DEG C. According to the titanium pipe welding process of the seawater lift pump system, the welding quality of the titanium pipe can meet the use requirements of the seawater lift pump system, the welding process is stable, the control is convenient, the practicability is high, and the large economic and social benefits can be produced.
Description
technical field [0001] The invention relates to the field of ship repairing and building, in particular to a titanium pipe welding process for a seawater lift pump system. Background technique [0002] Titanium and titanium alloys have good toughness, high temperature strength, corrosion resistance and processing performance due to their low density. These excellent properties are widely used in high-end product industries. However, due to the rapid melting and absorption of oxygen, nitrogen, hydrogen, and carbon in the welding process of titanium alloy (titanium absorbs hydrogen above 250°C, absorbs oxygen above 400°C, and absorbs nitrogen above 600°C), the strength and hardness of the alloy increase. The plasticity and toughness are reduced, and the weld is prone to brittle fracture; in addition, pores are easily generated during the welding process, and the pores have a large adverse effect on plasticity, fracture toughness, impact toughness and fatigue strength. At the s...
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