Welding, also known as welding, is a manufacturing process and technology that joins metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure.

Submergedarc welding is a kind of welding method which takes the arc as the heat source and carries out arc combustion in the welding state. Dueto the deep penetration, high productivity and high degree of mechanization of arc welding, it is suitable for welds of medium and heavy plate structure.

The welding process used for submerged arc welded straight seam steel pipe is submerged arc welding technology, which adopts filler welding and particle protection flux submerged arc.

Reducing high-pressure boiler pipe eddy current testing misjudgment several key factors

Argon arc welding is a welding technology developed from the principle of ordinary arc welding. The welding material is melted into liquid on the welded substrate through high current to form a molten pool. Argon is used to protectthe metal welding material and realize the metallurgical combination between the welded metal and the welding material. Due to the continuous supply of argon in high-temperature fusion welding, the oxidation of welding materials is prevented, and the welding materials will not contact with oxygen in the air.

Welding heat affected zone Welded joint is composed offusion zone, weld and heat affected zone. Welding heat affected zone:HAZ​ (heat affected zone for short) is the area where themicrostructure and properties of solid base metal on both sides ofthe weld change significantly under the action of welding thermalcycle, which is called welding heat affected zone.

The purchase of large-diameter straight seam steel pipes should be communicated in advance. Before purchasing steel pipes, the pre-designed specifications, lengths, materials, wall thicknesses, welding standards and welding seam requirements should be followed. These should be communicated well before purchasing.

Submerged arc welding technology is ideal for important applications such as pipelines, pressure vessels and tanks, rail manufacturing and large buildings. There are the simplest form of monofilament, double-filament structure, tandem double-filament structure, and multi-filament structure.

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The outbreak of COVID-19 has brought much inconvenience to the majority of foreign importers purchasing products from China. Since they are unable to make an on-the-spot investigation to Chinese suppliers and check the production of goods, which has led to "good opportunities" for some lawbreakers.