In the laser welding industry, there are many manufacturers that use laser welding of stainless steel workpieces, and the welding effect of laser welding machines is also very good. Laser welding of 304 stainless steel pipes is also a good choice. Next, stainless steel pipe manufacturer Huiyingsteel will introduce the laser welding technology of 304 stainless steel pipes in detail.
304 stainless steel pipe features
The raw material of 304 stainless steel pipe, as a kind of austenitic stainless steel, is stainless steel material with strong versatility, good corrosion resistance, heat resistance, and non-magnetic. The corrosion resistance of 304 stainless steel pipe is stronger than that of 200 series stainless steel products. 304 stainless steel pipe is also better in terms of high-temperature resistance, with good weldability, low sensitivity to cold cracks and hot cracks in welding, good hot workability such as stamping and bending, no heat, and can be as high as 1000-1200 degrees.
The background of 304 stainless steel pipe welding technology
In recent years, stainless steel has had a wider range of applications, and it is used more and more in aerospace, electronic devices, medical equipment, the nuclear industry, mechanical instruments, etc. Therefore, the encapsulation and welding of ultra-thin stainless steel pipes become very important.
The traditional welding method of stainless steel pipe is difficult to ensure the welding quality of the thin plate, and the laser welding of stainless steel pipe has incomparable advantages of traditional welding, which can effectively reduce the welding defects of stainless steel pipe. The research on welding technology of 304 stainless steel pipe is produced under this background.
During the use of stainless steel pipes, a large part of them must be welded, because the welding quality directly affects the performance of stainless steel parts. The welded joint of stainless steel pipe consists of three parts: weld metal zone, heat affected zone, and base metal (base metal) zone.
The advantages of laser welding for 304 stainless steel pipes
Compared with traditional welding, low-power pulsed laser seam welding has the advantages of high power density, energy concentration, small heat input, narrow weld seam, and small deformation, and can obtain a very small laser beam after focusing. Light spot, and precise positioning, these characteristics make 304 stainless steel tube laser seam welding more suitable for welding small-size workpieces than other welding methods. For the laser welding of ultra-thin 304 stainless steel pipes, due to the thin material, it is easy to vaporize and perforate, and it is necessary to obtain a continuous weld without burn-through. The key is the precise control of the stainless steel tube parameters.
A detailed explanation of laser welding of 304 stainless steel tube
304 stainless steel tube laser welding is to use the excellent directionality and high power density of the laser beam to work. The laser beam is focused in a very small area by the optical system, and a heat source area with high energy concentration is formed in the welded part in a very short time so that the welded object is melted and a firm welding spot and seam are formed.
There are two commonly used laser welding methods for 304 stainless steel tubes: pulsed laser welding and continuous laser welding. The former is mainly used for welding continuous and thin materials at a single point. The latter is mainly used for welding and cutting large and thick pieces.
Characteristics of 304 stainless steel tube laser welding processing method:
1. Non-contact processing, no need to pressurize and surface treatment of 304 stainless steel pipe.
2. Small solder joints, high energy density, suitable for high-speed processing.
3. Short-time welding, not only has no thermal influence on the outside world but also has small thermal deformation and heat-affected zone of the 304 stainless steel tube itself, especially suitable for processing high melting points, high hardness, and special materials.
4. No filler metal, no vacuum environment (can be carried out directly in the air), and no danger of X-rays being generated in the air like electron beams.
5. Compared with 304 stainless steel pipe contact welding process. No wear and tear of electrodes, tools, etc.
6. No 304 stainless steel pipe processing noise, no pollution to the environment.
7. Small 304 stainless steel pipe workpieces can also be processed. In addition, welding can be performed through walls of transparent material.
8. It can realize long-distance and difficult-to-reach parts by optical fiber, multi-channel simultaneous, or time-sharing welding.
9. It is easy to change the focal length of the laser output and the position of the solder joint.
10. It is easy to be mounted on automata and robotic devices.
11. In addition to welding 304 stainless steel pipes, conductors with insulating layers can be directly welded, and dissimilar metals with large differences in performance can also be welded.
The main parameters affecting the quality of 304 stainless steel laser welding
The main parameters that affect the quality of laser welding of 304 stainless steel tubes are welding current, pulse width, pulse frequency, etc. The main effects are as follows:
1. With the increase of the current, the width of the 304 stainless steel pipe weld increases, spatters gradually appear during the welding process, and the surface of the weld appears to be oxidized and rough.
2. With the increase of the pulse width, the width of the weld of 304 stainless steel pipe also increases. The change in pulse width has a very significant effect on the welding effect of the 304 stainless steel ultra-thin plate laser welding machine. A small increase in the pulse width may cause the 304 stainless steel tube sample to be oxidized and burned through.
3. With the increase of pulse frequency, the overlap rate of solder joints increases, and the width of solder joints increases first. remained basically unchanged. Observed under the microscope, the weld of 304 stainless steel pipe is getting smoother and more beautiful. However, when the pulse frequency increases to a certain value, the welding process spatters seriously, the welding seam of 304 stainless steel pipe becomes rough, and the upper and lower surfaces of the welded parts are oxidized.
4. The laser welding of ultra-thin plate materials is suitable for positive defocusing. Under the same defocusing amount, the weld surface obtained by positive defocusing laser welding is smoother and more beautiful than negative defocusing.
The above is the whole content of the laser welding technology of 304 stainless steel pipe brought to you by Huiyingsteel today. For more information on stainless steel pipe, please click below:
