Laser Welding For Stainless Steel Pipe
In recent years, as people become increasingly concerned about environmental issues
, to improve fuel efficiency, auto manufacturers are increasing the pressure. More rigorous, more restrictive regulations for industrial production and material processing technology brings challenges. These trends included in the fall.
Low exhaust emissions, lighter body and extended parts life.
Advances in materials processing, production of stainless steel pipe to bring a unique opportunity. Specifically, it asked manufacturers to produce such parts, they must have lighter weight, but still must have anti-corrosion characteristics, and to meet the strength requirements. In addition, the body of the Space Agency.
Limitations also stressed the importance of formability. Typical applications include the exhaust pipes, fuel pipes, fuel injectors and other components.
In the production of stainless steel capillary pipe, the first forming flat strip, and then makes its appearance as a round tube. Once formed, the pipe joints must be welded together. The weld can be largely affected the shape of parts. Therefore, to be able to meet strict manufacturing industry.
Welding test requirements of shape, select the appropriate welding technology becomes very important. There is no doubt, gas shielded tungsten arc welding (GTAW), high frequency (HF) welding, and laser welding has been the manufacture of stainless steel pipe tube has been applied to each.
High frequency induction welding
In the high-frequency and high frequency induction welding contact welding, the provision of current equipment and provide equipment for extrusion pressure is independent of each other. In addition, both methods can use the bar magnet, which is soft magnetic components, are placed inside the tube, it helps to weld together the steel edge of stream.
In both cases, the strips were cut and clean up after being rolled up, and then sent to the welding point. In addition, the heating process used in the induction coil used to cool down the coolant. Finally, some coolant will be used for extrusion process. Here, the role of the extrusion pulley on a very large force, in order to avoid porosity in the welding area produced; however, use a larger extrusion pressure will lead to glitches (or weld beads) increased. Therefore, the specially designed tool is used to remove the burr inside and outside the tube.
High-frequency welding process, one of the main advantages is that it can pipe high-speed processing. However, most of the existing solid phase welding typical situation is that high-frequency welding of the contacts if the use of traditional non-destructive techniques (NDT) is not easy for a reliable test. Welding cracks may low-intensity junction thin region of the flat, such cracks can not be detected using traditional methods, which in some demanding automotive applications may lack reliability.
Gas shielded tungsten arc welding (GTAW)
Traditionally, steel production plant chosen to protect the gas tungsten arc welding (GTAW) welding process to complete. GTAW in the two non-consumable tungsten electrode arc welding produces a. At the same time, protection from the spray gun to import inert gases to shield the electrodes, resulting in ionization of the plasma.
Son of flow, and the protection of the molten weld pool. This is an already established, and has been understood the process, it can be repeated to complete high quality welding process.
The advantage of this process can be repeated, the welding process without spills, and eliminate the porosity. GTAW is considered a process of electrical conduction, so relatively speaking, the process is relatively slow.
High frequency pulse arc
In recent years, GTAW welding power supply, also known as high-speed switch, make arc pulse more than 10,000 Hz. Steel plant's customers first to benefit from this new technology, high frequency pulse arc arc led to downward pressure on the traditional five times bigger than GTAW. Brought about by the representative.
Improved features include: burst strength was increased welding speed faster, reducing waste.
Steel production plant customers soon discovered that the soldering of this welding process are reduced form needs. In addition, the welding speed is relatively slow.
Laser Welding
In all of the steel pipe welding applications, the strip edges are melted, when using steel clamping bracket to the edge of extruded together, the margin of coagulation. However, laser welding, the unique nature of its high energy density beam. Laser beam melting of the material not only.
Surface, also produced a key hole, and even very narrow weld shape.
Power density of less than 1 MW/cm2 words, such as GTAW technology, it does not produce enough energy density to produce the key hole. In this way, no keyhole welding process are wide and shallow shape. High-precision laser welding brings greater efficiency of penetration, which in turn reduced the grain growth.
Better metallurgical quality; the other hand, GTAW higher heat input and slower cooling process led to the rough welded structures.
Usually, people think of laser welding process faster than GTAW, they have the same rejection rate, while the former lead to better metallurgical properties, which brings a higher burst strength and higher formability. When compared with the high-frequency welding, the laser processing of materials, the process of oxidation does not occur.
This makes the lower rejection rate may be higher formability.
Welded stainless steel capillary pipe factory, the welding depth is determined by the thickness of steel pipe. This production goal is to increase by decreasing the width of weld formability, while achieving a higher speed. In choosing the most suitable laser, one can not only consider the beam quality, we must also test.
Consider rolling machine accuracy. In addition, the rolling machine works in the size of the error must also be considered before reducing the restrictions on the time spot.
Pipe welding in the specific size in many problems, however, the main factors affecting the weld in welded box (more specifically, is the welding volume) on the joints. Once the strip after forming ready for welding, weld features include: the strip gap, serious / light.
Dislocation micro-welding, weld center line changes. Gap determines how much material to form a weld pool. Too much pressure will result in internal diameter pipe at the top or surplus materials. On the other hand, serious or minor dislocation can cause welding welding poor shape.
In addition, after welding box, the pipe will be further trimmed. This includes sizing and shape (form) on the adjustment. On the other hand, additional work to remove the serious / minor weld defects, but may not be removed. Of course, we hope to achieve zero.
Defects. In general, the rule of thumb is the thickness of weld defects should not exceed five per cent of material. Than this value will affect the strength of welded products.
Finally, the existence of the center line of high quality welded stainless steel capillary pipe production is very important. With the car market can be formed on the increasing importance of, with direct relevance is the need for a smaller heat affected zone (HAZ), and reduce the welding shape. In turn, this promotion of laser.
Technology, that improve the beam quality in order to reduce the spot size. With continuously variable spot size is small, we need more time to focus on middle joint scanning accuracy. In general, the steel manufacturers reduce this bias as much as possible, but in fact, to reach 0.2mm (0.008 inch) of the deviation is very difficult.
This brings the use of seam tracking system needs. The two most common tracking technology is mechanical scanning and laser scanning. On the one hand, mechanical systems use a probe to contact welding seams pool upstream, they will stick ash, wear and vibration. The system accuracy is 0.25mm (0.01 Inch), which for high beam quality of laser welding is not accurate.
On the other hand, laser seam tracking can achieve the required accuracy. In general, the laser light or laser spot is projected onto the weld surface, obtained by feedback to the CMOS camera image, the camera through the algorithm to determine the weld, the location of the error and gap junction.
Although the imaging speed is very important, but to provide the necessary closed-loop control to move directly in the joints when the laser focusing head, laser seam tracking device controller must be fast enough to accurately compile the weld position. Therefore, the seam tracking accuracy is important, but the response time equally important.
Overall, the seam tracking technology has been fully developed, it can allow use of higher-quality steel pipe factory in the laser beam to produce a better shape of the stainless steel pipe tube.
Therefore, laser welding found useless, which is used to reduce the welding of the porous, reducing the weld shape, while maintaining or increasing the welding speed. Laser systems, such as diffusion cooled slab laser, the beam quality has been improved by reducing the weld width can be further enhanced.
Formability. This development led to more stringent Steel Plant in the size of the control and the need for laser seam tracking.
This stainless steel pipe tube welded to a successful integration of technology depends on all the individual, it must be regarded as a complete system to treat.
by: lydia00123
Frbiz Reports "chile Earthquake," Affect The International Price Of Copper Metal Industry Always Be Connected With Your Dear Ones Holden Gemini Make Your Own Rap Beat Four Knock Out Points That Makes Liquid Hoodia The Best Choice Is Low to No Carbs Dangerous? Free Birth Chart Compatibility Battle of the Overpass Job Responsibilities Of A Company Secretary Part Time Earning Opportunity With Your Ease How To Find Anabolic Steroids For Sale Job As A Consultant Understanding the importance of a lawn aerator