Welding Billet Internal Quality Improving Measures
1 Introduction
Welding Billet Internal Quality refers to the presence or absence of internal defects in the welded billet. In the process of producing the welding billet, if the internal quality of the welding billet is not guaranteed, it will directly affect the subsequent processing performance and use performance of the welding products. Therefore, improving the internal quality of the welding billet has always been a major concern to the steel making industry. In order to improve the internal quality of the welding billet, this paper will introduce some improving measures.
2 Welding Billet Internal Quality Improving Measures
2.1 Ensure the Quality of the Ironmaking Materials
The toughness, plasticity, geometry and composition of the molten iron material used in the welding billet directly affect the internal defects of the billet. When selecting the materials, the quality of the material must be ensured, such as checking the chemical composition and sulfur content to make them within the specified range. Also, the comprehensive performance indicators of the material should be strictly monitored during the smelting process, such as finished product proportion and pouring temperature, in order to ensure the quality of the materials used.
2.2 Preheating for Ingot Molds
Preheating the ingot molds before use can make the structural components of the molds form a certain creep effect in combination with the slag, so that the interface between the molds and the molten steel has a certain bonding state, which can effectively reduce the shedding caused by adhesion when the molten steel flows down the ingot molds. Therefore, preheating the ingot molds to ensure the normal use of the molds is one of the effective measures to improve the internal quality of the welding billet.
2.3 Set Up the Shell of Ladle
The shell of the ladle can isolate the molten steel from the air and reduce the occurrence of burning due to the contact of molten steel and air. The installation of the shell of the ladle can effectively improve the internal quality of the welding billet, reduce the generation of graphite balls and protect the surface of the molten steel from oxidation.
2.4 Strengthening the Control of Ladle Temperature
The temperature of the ladle is directly related to the internal quality of the welding billet. If the temperature of the ladle is too low, the high-temperature material at the bottom of the ladle will flow too fast, resulting in incomplete melting of the materials, while if the temperature of the ladle is too high, the molten steel will be burnt, affecting the internal quality of the welding billet. Therefore, the temperature of the ladle should be closely monitor during the operation of the ladle to keep it within the specified range and ensure the internal quality of the welding billet.
2.5 Improve the Marking Assay
The marking assay is an indispensable link in the production process of the welding billet. If the marking assay is not accurate enough, it will inevitably cause a great difference between the required ingredients and the actual ingredients of the welding billet. Therefore, laborious experiments should be conducted to improve the accuracy of marking assay, so that the contents of different components in the molten steel can be more precisely controlled to ensure the internal quality of the welding billet.
3 Conclusion
The quality of the welding billet internal directly affects the use performance and processing performance of the products. In order to improve the internal quality of the welding billet, it is necessary to take a series of improvin measure such as ensure the quality of the ironmaking materials, preheating the ingot molds, setting up the shell of ladle, strengthening the control of ladle temperature and improving the marking assay. Only by taking these measures together can the internal quality of the welding billet be effectively improved.
