Prior to the 1970s, high-power continuous waveform (CW) lasers were not developed, so research focused on pulsed laser welding (PW). Most of the early laser welding experiments used ruby pulsed lasers. The typical peak output power Pm of 1ms pulse is about 5KW, the pulse energy is 1~5J, and the pulse frequency is less than or equal to 1 Hz. Although the higher pulse energy was able to live at the time, the average output power P of these lasers was quite low, which was mainly determined by the low operating efficiency of the laser and the excited behavior of the luminescent material. Due to its high average power, the laser becomes the preferred equipment for spot welding and seam welding soon after it appears. The welding process is carried out by solder joints until the continuous power waveform laser of 1KW or more is born. The true meaning of laser seam welding is achieved.
Current status and prospects of welding automation technology
With the increasing maturity of digital technology, digital welding machines and digital control technologies, which are connected to the technology at the representative office, have steadily entered the market. The national large-scale foundation projects such as the Three Gorges Project, the West-East Gas Pipeline Project, the aerospace project, and the ship project have effectively promoted the development and progress of advanced welding, especially welding automation technology. The automation of welding is constantly changing in the manufacture of automobiles and parts. China's welding industry has gradually moved toward "efficient, automated, and intelligent." The welding automation rate in China is still less than 30%, which is far from the 80% of developed industrial countries. From the 20th century, the country has gradually promoted the basic welding method of automatic welding in various industries - gas shielded welding to replace the traditional manual arc welding, which has achieved initial results. It is expected that in the future, domestic automated welding technology will develop at an unprecedented rate.
The status quo of efficient, automated welding technology
In the 1990s, China's welding industry took the mechanization and automation of the welding process as a strategic goal. It has been implemented in the development of science and technology in various industries, developing welding production automation, researching and developing welding production lines and flexible manufacturing technologies, and developing applications. Computer-aided design and manufacturing; flux-cored wire increased from 2% to 20%; submerged arc welding consumables will continue to grow at the 10% level. Among them, the growth rate of flux-cored wire is obviously increased, and it will exceed the solid wire in the next 20 years, and will eventually become the leading product of the welding center.