Post welding heat is a measure to heat or preserve the welding area after the welding groove is filled.

In high frequency longitudinal welded pipe, cracks include long cracks, local periodic cracks and irregular cracks. Some steel pipes do not produce obvious cracks immediately after welding, but cracks appear after straightening,flattening and hydrostatic test.

Steel pipes can be seen everywhere in our daily life. It is widely used in heating, water supply, oil and gas and other industrial liquid transportation, which brings great convenience to our life and production.

Como todos sabemos, bajo el enriquecimiento de elementos químicos de óxido de estaño de tubería soldada de gran diámetro, pero no hay investigaciones relevantes sobre los efectos del fenómeno de las características de fractura de retardo. Por lo tanto, con respecto al óxido de hierro enriquecido por debajo de Ni, el tratamiento térmico es el uso del real Se evaluó la evaluación de la característica de fractura retardada de la barra de acero PC de escala de óxido pegajoso del producto, en lugar de utilizar el mecanizado convencional de muestras terminadas.

Long-distance oil and gas pipelines are an important way to ensure energy. In the process of anti-corrosion construction of oil and gas pipelines, the surface treatment oflsaw pipe is one of the key factors that determine the service life of pipeline anti-corrosion. It is whether the anti-corrosion layer and the steel pipe can be firmly combined the premise.

Since the weld is in the horizontal position during welding and thedroplet is mainly transmitted by gravity according to the platethickness, larger welding current and thicker electrode can be usedfor welding.

The service life of ships is generally about 20 years, and the service life of steel pipes in marine engineering can reach at least 40 years. In addition to conventional systems, there are also special drilling and production equipment systems, as well as processing flow systems for crude oil, liquefied petroleum gas and liquefied natural gas in offshore engineering.

The relationship between welding speed and weld quality should be understood dialectically and cannot be ignored. It is mainly reflected in the heating stage and crystallization stage.

Steam boiler means that the water is heated to a certain temperature steam parameters and production of industrial boilers, water becomes steam drum in heat, fire emits heat in the furnace is a steam boiler works.

For the ferritic stainless steel, grain growth in the heat affected zone, welding joint ductility and toughness sharp decline, brittle, easy to form cold cracks in the welding residual stress. Welded austenitic stainless steel welding process is improper or inappropriate choice of welding materials, prone to intergranular corrosion, welding hot cracking and embrittlement of welded joints and a series of defects, a direct impact on the performance of welded joints and weld quality.