What method is used to corrode the weld joint, and what method is used to corrode the weld joint

1. The length of the arc, the length of the arc is related to the type of electrode coating and the thickness of the coating. However, short arcs should be taken as much as possible, especially low-hydrogen electrodes. Long arcs can cause stomatosis.

The short arc can avoid harmful gases such as O2 and N2 in the atmosphere from invading the weld metal and forming undesirable impurities such as oxides and affecting the quality of the weld. Second, the welding speed, the appropriate welding speed is based on the diameter of the welding rod, the type of coating, the welding current, the heat capacity of the welded object, the beginning of the structure and other conditions have their corresponding changes, can not make the standard provisions. Maintain the right welding speed, and the slag can cover the molten pool well.

All kinds of impurities and gases in the molten pool have sufficient time to float out, so as to avoid the formation of slag inclusions and porosity of the weld. If the speed of the rod is too fast during welding, the shrinkage stress will increase when the welding part is cooled, causing cracks in the weld. ...

A cutting machine is the most effective and fastest method.

Of course, there are many ways to cut, such as gas cutting.

The welding points of the German equipment imported by my unit are all welded with the latest oxygen-free welding, to ensure that there are no bubbles and impurities and other problems, and later because the installation needs to be cut, the Germans brought a new laser segmentation equipment to get it quickly, without a little gas pollution, cow!

Solder joints are also solved by fixed-point ionization, which is mainly used in the shipbuilding industry.

Or my friend told me.

Electric welding or soldering.

Weld large joints with an angle grinder, small joints with sandpaper or an appropriate file, if they have to be corroded, dilute sulfuric acid or dilute hydrochloric acid.

Soldering should be used more on electronic components, and I have never heard of corroding solder joints.

Can't you cut with a hand grinder? It has to be corroded. It's slow and it hurts the material. There are many other methods, but corrosion is the hardest. You can also use chisels, solder joints are fine, and the weld is difficult. It can also be cut with oxygen. In addition, metal engraving machines and corrosion machines can also be used.

Your first priority should be to remove rust. The following two efficiency rust removal methods:

High-pressure water mill rust removal: It is mainly used to spray high-pressure water flow to remove rust on the surface of the shelf, which has a fast effect and does not damage the shelf.

Shot blasting and rust removal: The high-speed rotating impeller is used to throw the rust removal abrasive to the surface of the shelf to achieve the effect of rust removal.

At the same time, the shelf user should keep the warehouse dry, which is beneficial to both the goods themselves and the shelves. The rust of metals is mainly due to the oxidation reaction of the metal itself with oxygen in the air, and the humid environment acts as a catalyst. Please refer to the anti-rust maintenance method of the shelf.

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.

Several methods of electric welding and transporting bars are simple and practical, suitable for novice friends.

1. Flat welding or rotation.

2. Horizontal welding or vertical fixation.

3. Vertical welding. 4. Upright welding.

5. Horizontal fixation.

Fixed. 5. Vertical welding (downward) fillet weld (various positions).

Manual arc welding several types of welding:1

Flat weld inclination angle 0 ° flat welding position for welding, weld inclination 0 ° weld rotation angle 90 ° welding position 2 vertical welding position for weld inclination 90 ° (vertical) 270 ° (vertical) welding position 3

Weld inclination °; Weld angle ° The welding position is called the horizontal welding position, and the horizontal welding position is called horizontal welding 4

The inverted welding factory, commonly known as upside welding, requires a line of sight between 45 degrees and 90 degrees to see the weld.

Hello, the welding methods are generally buried welding, single-sided welding, double-sided welding, vertical welding, and flat welding.

Electric welding methods are mainly flat welding, vertical welding, and vertical welding.

Passivating a protective film with a liquid trisodium phosphate prevents corrosion.

Drink pole protection is a good choice.

This is mainly caused by the high carbon content of this type of stainless steel, and the heat generated during the welding process will cause the carbon and the chromium in the steel to form a high-chromium Cr23C6 type carbide, which will lead to the dilution of local chromium and reduce the corrosion resistance of the weld.

This problem can be solved by post-weld heat treatment, or by reducing the C content to the following.

Because columnar grains will be formed on the stainless steel welds,

You can weld that hole on, or you can wrap it with rubber and clamp it tightly, and it's best to replace the PPR pipe.

Let's change the pipe, there are sanitary standards for drinking water, and the iron pipe is not allowed to be used now.