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1） The influence of welding current on weld formation Under certain other conditions, with the increase of arc welding current, the weld penetration depth and remaining height increase, and the penet...

The straight seam high frequency welded steel pipe (ERW welded pipe) has advanced forming technology, reliable quality, good welding position, stable welding parameters, fast welding speed and high ou...

The molten pool refers to the part of the base metal that is melted into a pool due to the heat of the welding arc. The geometrical liquid metal part formed on the weldment during welding is called th...

There are many standards for selecting oil casing manufacturers, which can be pided into short-term standards and long-term standards according to the length of time. The short-term standards for sele...

According to the different requirements of the production process of the oil casing pipe, the length measurement system of the oil casing also has a variety of measurement methods. Let us look at the ...

There are couplings for casing pipe and couplings for tubing, the function is the same that to connect the pipe each other. On the other hand, still there are some differences between the two. Casing...

Annealing process of seamless steel pipe: The seamless steel pipe is heated to a certain temperature, kept for a certain period of time, and then slowly cooled to room temperature. Purpose of anneali...

1) Normalizing of seamless steel pipe Process: The steel parts are heated to 40~60°C above the critical temperature, kept for a certain period of time, and then cooled and heat treated in the air. Pu...

The heat treatment process of seamless steel pipe mainly includes the following 5 categories: 1. Quenching + high temperature tempering  The steel pipe is heated to the quenching temperature to trans...

1. Cracks Hot cracking, in the process of welding seam cooling, due to the sulfur and phosphorus impurities in the steel or welding material and the steel to form a variety of brittle and hard low-me...