Permanent Steel Manufacturing Co.,Ltd

Home  >  Hot News  >  Current News

CS Hollow Pipe Defect in Welding Cracks

Date:2017-12-25    keywords:cs hollow pipe
CS hollow pipe welding cracks are more serious processing defects, it will reduce the cross-sectional area of the weld stress stress concentration. Welding cracks are generally vertical and horizontal, longitudinal cracks in the weld pool of the most common recess, because the molten pool notch is not filled, but also easy to sink harmful impurities to reduce the local moon. And the notch at the weld and the final cooling when the Department of cooling, cooling shrinkage stress is also concentrated here. Horizontal cracks are common in alloy steel welding.

The formation of cs hollow pipe welding cracks mainly due to the following five points:
(A) High cooling rate when welding prone to cracking. Therefore, welding should avoid the tuyere and avoid being wet with rainwater. In welding, high carbon steel or alloy steel, according to the composition or characteristics of the base metal, and some to take measures to heat and heat before welding.
(B) Improper welding sequence is also prone to cracks, when the sequence is improper welding shrinkage force will form the knot, hinder the free shrinkage of the weld, resulting in greater shrinkage stress and weld cracks.
(C) With the cs hollow pipe chemical composition, crystal structure, smelting methods and so on. Such as steel, the higher the carbon content or the higher the amount of alloy, the higher the hardness of steel, usually easier to crack in the welding.
(D) Ambient temperature around the welding is low, or in the tuyere overheating caused by excessive heat can cause cracks.
(E) Welding cs hollow pipe containing sulfur, phosphorus, carbon high weld prone to cracking. Phosphorus is a harmful element, sulfur-containing high weld hot brittle, phosphorus-containing high weld cold brittleness, the amount of sulfur content of the electrode must be below 0.0035.

©2017 Permanent Steel Manufacturing Co.,Ltd  https://www.permanentsteel.com  All Rights Reserved.  Terms of Sale|Privacy Policy

We use cookies to offer a better browsing experience, analyze site traffic, and personalize content. By using this site, you agree to our use of cookies.