Mixed protection gas for large-scale aluminum container group forming welding
A shielding gas and container technology, which is applied in the field of mixed shielding gas for team welding of large aluminum containers, can solve the problems of harsh welding quality, multiple welding quality, and reduced mechanical properties of welded joints, so as to improve mechanical properties and reduce labor intensity , The effect of improving welding production efficiency
Inactive Publication Date: 2015-05-27
SHANGHAI ERSHIYE CONSTR CO LTD +1
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[0002] At present, the aluminum container in the cold box of the large-scale air separation unit considers the factors of transportation and hoisting, and generally chooses to carry out butt welding of the upper and lower sections of the container at the installation site. A single inert gas is used as the protection of manual gas tungsten arc welding during welding. Gas such as argon (Ar) is used as a protective gas for manual tungsten welding; this welding method is widely used in the butt joint of small and medium-sized air separation unit aluminum containers with a wall thickness less than or equal to 12mm, and single argon is used as a protective gas. The welding quality of the gas is relatively harsh to the natural environment, and there are often many welding quality problems due to changes in natural environmental factors
The on-site assembly process of large aluminum containers is relatively complicated, and the large wall thickness and perimeter of the container increase the difficulty of welding. During the hoisting process, the upper container of the assembly has always needed to be hoisted continuously by a large crane and other auxiliary tools to complete the assembly. And welding, there are more complex stress changes in this process, easy stress changes reduce the mechanical properties of welded joints
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[0008] The present invention is further illustrated below by specific examples.
[0009] A mixed shielding gas for team welding of large aluminum containers, which includes helium and argon; the proportion of helium is 30%~50%, and the proportion of argon is 50%~70%.
[0010] For the above-mentioned mixed shielding gas used for team welding of large aluminum containers, it is especially preferable when the proportions of helium and argon are both 50%.
[0011] The present invention utilizes the respective advantages and disadvantages of the two elements of helium and argon, and uses the two elements in combination to complement each other, thereby greatly improving the effect of the protective gas. Commonly used single argon as a protective gas can make the droplet transfer very stable when welding, ensuring no splash or minimal splash, but when pure argon is protected, the welding heat input is small and the penetration depth is shallow, so it is not suitable for welding thic...
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The invention relates to the field of large-scale aluminum container manufacturing, in particular to mixed protection gas for large-scale aluminum container group forming welding. The mixed protection gas comprises helium gas and argon gas, and is characterized in that the helium gas accounts for 30 to 50 percent, and the argon gas accounts for 50 to 70 percent. The mixed protection gas has the advantages that the helium gas and the argon gas are used in a mixed way, the goal of mutual complementing is achieved, the effect of using the helium gas and the argon gas as protection gas is greatly improved, the occurrence of welding defects (such as welding air holes, slag inclusion and cracks) of a thick-wall aluminum container (the aluminum container with the wall thickness greater than 15mm) is reduced, the mechanical property of a welding joint is improved, further, the work intensity of workers is reduced, and the welding production efficiency is also improved.
Description
technical field [0001] The invention relates to the field of manufacturing large aluminum containers, in particular to a mixed shielding gas used for group welding of large aluminum containers. Background technique [0002] At present, the aluminum container in the cold box of the large-scale air separation unit considers the factors of transportation and hoisting, and generally chooses to carry out butt welding of the upper and lower sections of the container at the installation site. A single inert gas is used as the protection of manual gas tungsten arc welding during welding. Gas such as argon (Ar) is used as a protective gas for manual tungsten welding; this welding method is widely used in the butt joint of small and medium-sized air separation unit aluminum containers with a wall thickness less than or equal to 12mm, and single argon is used as a protective gas. The welding quality of gas is relatively harsh to the natural environment, and there are often many welding...
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IPC IPC(8): B23K35/38
CPCB23K35/383B23K9/167B23K2101/12
Inventor 程威
Owner SHANGHAI ERSHIYE CONSTR CO LTD