Electric welding How should the reverse flow technique be welded

Hehe, friend.

Backflow welding, also known as downward welding, is prohibited in general manufacturers because it will cause a decline in product quality.

I don't think you're a master of dry weld post-processing.

If you are a beginner and want to use backflow soldering to solder a relatively large gap.

Just do what I say.

Put the electrode or wire facing up, and then the fire, at this time the molten iron will flow downward, and you use the blowing force of the arc to resist the molten iron, so that it will weld slowly.

But the speed should be mastered, fast, but not too fast.

Reverse flow welding (also known as downward welding) is a method of welding from top to bottom, ordinary welding rods cannot be welded in this way, and the construction requirements are absolutely not allowed, because there will be slag phenomenon. Don't know the material and thickness of your welding base metal. Under normal circumstances, vertical welding should be adjusted according to the thickness of the base metal, and the appropriate welding current can be continuous arc welding, and the final formation is very beautiful, especially alkaline electrodes (such as J507 electrodes).

In our country, welding operations need to be licensed, welders are the type of work that belongs to the access category, in the professional qualifications of skilled personnel, only five of the 81 types of work in the access category, welders are one of them, and the actual situation is that most of the industry practitioners are unlicensed operations. With the continuous standardization of technology and the relevant requirements of the industry, more and more people want to take a welding certificate, the advantage of the certificate is still very large, first of all, the salary of the certificate and the non-certificate are very different, often able to reach more than double or higher level. Therefore, the issue of short-term welder training has naturally become a concern for practitioners.

Welding as an industrial "tailor" is a very important means of processing in industrial production, the quality of welding plays a decisive role in the quality of the product, so, what is the future development of welding technology?

Industry outlook. With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery manufacturing and other industrial sectors, in China's economic development, welding technology is an indispensable means of processing. After entering the 21st century, welding is an important part of the manufacturing industry, and the rapid development, so it has brought unprecedented development opportunities to the welding industry.

At present, China consumes 300 million tons of steel every year (about tons of welded structure), and needs about 750,000 welding machines, and the welding industry will continue to grow in the next 8 10 years.

In the welding process of this welding method, due to the influence of gravity, the filler metal will flow downward before filling the weld, which is easy to cause unpenetrated and undercut.

Defects such as welding nodules.

This welding method is not allowed unless it is required by a special welding process.