In recent years, with the development of the economy, especially with the continuous deepening of reform and opening up, China's economic construction has made tremendous progress. At the same time, China has also made significant progress in the welding of pipelines and other engineering projects. Titanium welding is a common type of welding, and the quality control of the welding process has a significant impact on the color of the weld seam. Due to the intuitive nature of titanium weld color, the study of the relationship between titanium weld color and welding quality is of great significance. Based on years of research and practical work experience in quality control and process of titanium welding, the author of this article explores the relationship between the welding quality of titanium welding and the color of titanium welds, hoping to contribute to the research in this field.
1. Effects of oxygen and nitrogen
Oxygen and nitrogen interstitial fusion in titanium causes lattice distortion, increases deformation resistance, increases strength and hardness, but reduces plasticity and toughness. The presence of welding oxygen and nitrogen in the weld seam is unfavorable and should be avoided.
2. The impact of hydrogen
The increase of hydrogen will cause a sharp decrease in the impact toughness of titanium weld metal, while the plasticity will decrease slightly, and hydrides will cause brittleness of the joint.
3. The impact of carbon
At room temperature, carbon is solid dissolved in titanium in the form of gaps, increasing strength and decreasing plasticity, but not as obvious as oxygen and nitrogen. When the carbon content exceeds the solubility, hard and brittle TiC is generated, which is distributed in a network and prone to cracking. The national standard stipulates that the carbon content in titanium alloys should not exceed 0.1%. During welding, oil stains on the workpiece and welding wire can increase the carbon content, so it needs to be cleaned thoroughly during welding.
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