1. Oxide film: Aluminum in the air and welding is easy to oxidize, the alumina (Al2O3) high melting point, very stable, not easy to remove. Hinder the melting and fusion of the base metal, the ratio of the oxide film is significant, it is not easy to surface, easy to produce slag inclusion, not fusion,…
In the production of oilfield construction units, welding of magnetized pipeline is often encountered, because of the large magnetic deflecting blowing during welding of magnetized pipe. Poor weldability. This paper mainly introduces the magnetized tube using dc degaussing electrode arc welding, or ac degaussing electrode arc welding, and by means of electromagnet or permanent magnet…
Molten pool temperature, directly affect the welding quality, molten pool temperature is high, molten pool is larger, hot iron flow is good, easy to fuse, but too high, hot iron easy to drip, single-sided welding double-sided formation of the back easy to burn through, forming welding tumor, forming is difficult to control, and joint plastic…
The factors that affect the fatigue strength of the base metal (such as stress concentration, sectional size, surface state, loading condition, medium, etc.) also affect the fatigue strength of the welded structure. In addition, some characteristics of the welded structure itself, such as the change of the joint near the joint area, welding residual stress,…
1) Weld the bottom layer In order to achieve single-sided welding and double-sided forming, breakdown welding method should still be used for the bottom layer. During the breakdown welding of the inclined pipe, the molten pool should always be kept in a horizontal state. The diameter of the electrode is 3.2mm and the welding current…
Submerged arc welding is a welding method to bury the strong welding arc light. Naturally, the arc light can not be seen in the welding process, and most of the welding is automatic, and the working conditions are greatly improved. With the development of industrial production, more and higher requirements are put forward for welding…
Listen to a engaged in welding for more than 10 years of welding veteran master, beginners in welding can correct welding current will be very important for welding quality, because the welding current has a great impact on the weld shape. Welding current is too small, will cause penetration, no fusion and sticky electrode phenomenon;…
1. What is welding power source? A: In the welding machine, the equipment that supplies the electricity needed for welding and has the electrical characteristics suitable for welding is called the welding power source. 2. Why are there special requirements for arc welding power sources? What are the requirements? Answer: In order to ensure the…
Handheld laser welding machine which is a new type of welding method, mainly for thin wall material, precision parts welding, which can realize welding, butt welding, welding stack, seal welding, such as depth ratio is high, the weld width is small, small heat affected zone, small deformation, welding speed, welding seam smooth, beautiful, without treatment…
We are often amazed at the beauty of the weld, but have to accept a reality, such a beautiful weld would appear unqualified detection situation? This is a headache for engineers. Why are there cracks in the welds? How do they come about? How to avoid it? What is welding crack? Welding crack is one…
