In the process of high-frequency welding of steel pipes, the control of the welding process and process parameters, the position of the induction coil and the location of the resistance have a great influence on the welding quality of the steel pipe welding.

The biggest difference between resistance welding (ERW) steel tubes and seamless steel tubes is that ERW, if welded, is the key to the quality of ERW steel tubes. The modern ERW steel pipe production process and equipment have made the ERW steel pipe a satisfactory solution for the international community, especially the unremitting efforts of the United States and other years.

According to Indonesia, "Jakarta post" reported on February 8th, the Indonesian iron and Steel Association released data show that in 2017 Indonesia imported 6 million 430 thousand tons of steel, accounting for 48% of the total annual steel consumption in 2015 and 2016, respectively; Indonesia imported steel 6 million 850 thousand tons and 6 million 490 thousand tons, is the world's five largest importer of iron and steel.

According to researchers, this dense wood can block bullets. In this study, stainless steel balls fired by air guns easily penetrated ordinary wood but did not penetrate the same thickness of treated wood. The team said that this technology may bring a new kind of strong, lightweight wood material. This material can be used to replace steel in construction, to make lighter and better performing vehicles, and even to make bulletproof armor.

Before the European Commission negotiated details of the trade retaliatory measures against the United States, a detailed list of retaliatory tariffs has already been placed on the table of Chairman Juncker. The total amount of this list is close to 2.8 billion euros, and the EU has set a 25% tax rate for retaliation. These include T-shirts, jeans, cosmetics, motorcycles, yachts and other consumer goods worth about EUR 1 billion; agricultural products worth about 951 million euros, such as orange juice, bourbon and corn; and steel and other industrial products worth about 854 million euros. .

In March 1st, Malaysia Kuantan Industrial Park Shanghai Baoye engineering project 350 tons of steel steelmaking and continuous casting of No. 3 caster 7 machine 7 strand billet billet roller began commissioning.

1. Poor thick-walled steel pipe that can be easily folded. 2. Bad thick-walled steel pipes tend to scab.

The method for quality inspection of LSAW PIPE, in which the physical method is the most commonly used inspection method, physical examination is a physical phenomenon to determine or check the application of the method. magnetic force Magnetic flaw detection can only find the shortcomings of the appearance and appearance of the magnetic straight seam welded pipe. The disadvantages can only be quantitatively analyzed. The nature and depth of the flaw can only be estimated based on experience. Magnetic flaw detection is the use of magnetic field to discover the leakage of magnetic longitudinal weld seams. According to the method of measuring magnetic flux leakage, it can be divided into magnetic powder method, magnetic induction method and magnetic recording method, in which the magnetic powder method is the most widely used.

The straight seam welded pipe production line is a pipe production line integrating pipe welding, finishing, pipe processing, and heat treatment of pipe sleeves. ERW steel pipe production line introduces the molding equipment and technology developed by Germany's SMS group, and is equipped with the world's most advanced non-destructive testing equipment, high-frequency welding equipment, welding equipment and heat treatment.

US media claimed that South Korea mentioned its role in the situation on the peninsula. Europe reminds the United States that it is actually a long-term military ally of the United States. Australia has used secret weapons: President Trump's good friend and legendary golfer Greg Norman. Just one day after Trump signed an order to impose tariffs on imported steel and aluminum, the manufacturing nations began to work hard to enter the list of exempted countries for these tariffs, including persuasion, threats, personal charisma and diplomatic influence. According to the report of the “New York Times” website on March 9th, while EU leaders listed the list of US products levied on retaliatory tariffs and threatened to sue the WTO, they also reviewed the long history of friendly relations between Europe and the United States. German Minister of Economic Affairs Brigitte Teplice wrote to US Secretary of Commerce Wilbur Rose. She said that Europe and the United States should work together to solve the real problem: the global steel production capacity that led to the price drop. She said: "On this issue, Europe and the United States need unity and no trade conflicts can occur."

At present, ordinary fluids on the market of general straight seam welded pipes are generally used in high frequency resistance welding production. They are characterized by high production efficiency, small welding heat affected zone, and low requirements on the quality of bonding surfaces, but the molding quality requirements and molding process Any change in the shape of the V-shaped opening in the hole may cause welding quality problems.

Cold welding is the action of mechanical force, molecular force or power, which spreads the welding material to the surface of the process equipment (method). On the microscopic scale, this phenomenon is closely related to the diffusion of atoms on the surface of the material.

Classification of seamless steel tubes 1. Line tube. Such as: water, gas pipes, steam pipes, seamless pipes, oil pipelines, oil and gas pipelines. Agricultural irrigation faucet with pipe and sprinkler pipe.

1. Oiling sign: The steel pipe hydraulic pressure tester can prevent corrosion after passing oil, and can be marked according to user requirements. 2. Leveling and milling: The flat steel anvil is initially curled and then subjected to two-sided steel milling by a blade-milling machine so as to satisfy the requirements for the width of the plate, the parallelism of the edges of the plate, and the shape of the groove.

Straight seam welded pipe weld appearance basic requirements:

After a series of cold rolled tubes have the following characteristics: 1. Through the organization of cold-rolled fine particle tubes, the mechanical and physical properties of the tube are superior to the upper computer;

According to the chemical composition of the seamless steel pipe, the state of the organization, the size of the product section, the defects that may occur after cooling, and rolling, cooling equipment, space and cooling conditions, can be used to cool to room temperature using different cooling methods.

Straight seam welded pipe (ERW straight seam welded steel pipe) is formed on the hot rolled plate of the forming machine, the skin effect and proximity effect of the high frequency current, melting of the pipe edge heating to the extrusion roller pressure welding to achieve production.

Straight seam welded pipe (ERW straight seam welded steel pipe) is formed on the hot rolled plate of the forming machine, the skin effect and proximity effect of the high frequency current, melting of the pipe edge heating to the extrusion roller pressure welding to achieve production.

Roll-bending steel direct high-frequency resistance welding technology is a rapid production of pipeline technology, and it is widely used in many fields such as downhole casing and oil and gas gathering pipelines.

ERW pipe unit more faults, the cause of the fault is also more complicated, the results are often caused by a variety of reasons, may be caused by a variety of reasons. Scratches Pipe welding scratches are mainly composed of two parts, one guide, the other is the extrusion welding mechanism.