Perfect Welding Of Titanium And Titanium Alloys: Detailed Steps & Key Points
Perfect Welding Of Titanium And Titanium Alloys: Detailed Steps & Key Points
1. Selected Welding Methods
When welding titanium and titanium alloys, the choice of method is essential.For thin plates below 3 mm, tungsten argon arc welding is recommended, and its delicate control ability can ensure that the welds are flawless.
For plates above 3 mm, melting pole argon arc welding has become the first choice because of its efficient melting capacity.
In addition, advanced technologies such as submerged arc welding and vacuum electron beam welding are also optional, but decisions need to be made according to specific needs.
2. Meticulous pre-welding preparation
1) Surface cleaning： Mechanical cleaning: use fine sandpaper or stainless steel wire brush, or even cemented carbide scraper, to completely remove the oxide film and impurities in the welding area.
2) Chemical cleaning: Use a specific ratio of pickling solution (such as HF+HNO3 mixture) for deep cleaning, then rinse with water and dry to ensure that there is no residue on the surface.
3) Equipment and materials： A DC argon arc welding power supply with high-frequency arc induction and stable external characteristics is selected to ensure the stability of the welding process.
The purity of argon must reach more than 99.99%, and it must be continuously supplied until the weld is completely cooled to prevent oxidation.
The welding wire should match the composition of the base material, or choose a slightly lower strength welding wire according to demand to improve the plasticity of the weld.
3. Carefully operated welding process
1) Gas Protection: Use a special protective drag cover to ensure that the welding area and welds are protected from harmful gases, while controlling the temperature below 250℃.
2) Fine Operation: keep a small angle between the welding wire and the welding parts, and feed it smoothly into the bath to avoid large lateral swings to ensure the uniformity and quality of the welds.
3) Continuous Protection: When the arc is broken and the weld is finished, continue to pass argon protection until the weld and the heat-affected area are cooled to a safe temperature.
4. Strict Weld Inspection
By observing the color of the weld, the welding quality can be preliminarily judged.
The ideal weld should be silver-white or light yellow, dark yellow and golden purple have different acceptance levels according to the weld level, while dark blue indicates that the welding quality is unqualified.
5. Precautions That Cannot Be Ignored
1) Strictly control the welding parameters to ensure the stability of the welding process and the quality of the welds.
2) Maintain the cleanliness of the welding environment and prevent pollutants from entering the welding area.
3) Welders need to undergo professional training and be proficient in the welding characteristics and operating specifications of titanium and titanium alloys.
4) Following the above steps and precautions, you will be able to successfully achieve the perfect welding of titanium and titanium alloys.