Study on prevention of welding defects in high power CO2 laser materials processing

For CO2 laser welding of large output, when a deep penetration welding in s ingle pass is done in the ambient atmosphere, it is known that blowholes ma y occur because of the in-keyhole gas being entrapped in molten metal. Keep ing this problem in mind and changing the parameters, we conducted welding tests with full-penetration bead-on-plate welding, and checked by radiograp hic test for welding defects. The experimental results demonstrated that th e larger the specimen thickness, the more frequently welding defects occur, and that generation of welding defects depends upon the amount of welding heat input. Welding defects such as blowholes remain in metal, because the gas once entrapped into keyhole floats up in molten metal, and it is enclos ed in the course of solidification. From this, we can verify the theory tha t a larger welding heat input, in the case of the good appearance full-pene tration bead-on-plate welding, may be favorable for preventing welding blow holes. It can be assumed, therefore, that a larger heat input may hinder to oling of molten metal, and need a longer time for metal solidification; in this longer span of time, in-molten metal gas may escape while the metal is sufficiently heated. (C) 1999 Laser institute of America. [S1042-346X(99)0 0606-3].