Upstream steel industry raw materials such as iron and steel industry, the steel industry supply of steel is the material basis of industrial development, technological advances for the steel structure of the steel industry has created favorable conditions for the application. The domestic steel industry, some large companies have begun research and development building structural steel varieties and technologies, have developed a high-strength steel and fire-resistant, weather-resistance, water, anti-lamellar tearing resistance at low temperature steel, as well as H-beam, high performance pre-painted steel, cold-formed steel, etc., for the development of steel industry has laid a good foundation for the application. Weld defects: (1) lack of penetration: the parent metal joints in the middle (X groove) or root (V, U groove) is not completely fused together blunt edges while leaving local unfused. Lack of penetration reduces the mechanical strength of the welded joints of steel price stream, gaps and ends in incomplete penetration will stress concentration points to bear in weldments easily lead to cracking load. (2) lack of fusion: between the solid metal and filler metal (between weld and base metal), or filled (between bead multi-pass welding or soldering when layer) is not completely melted metal partial combination, or In the spot welding (ERW) is not complete fusion between the base metal and the base metal with steel works factory in Dongguan, sometimes also often accompanied by the presence of slag. (3) porosity: In melting the welding process, the gas or gas within the weld metal exterior infiltration metal bath is cooled and solidified before the overflow is not enough time left in the holes or pores of the weld metal formed on the surface or inside, depending on their form can be divided into individual pores, chain pores, pore density (including honeycomb pores), etc., especially in the electric arc steel works in Dongguan, due to the metallurgical process time is very short, the pool quickly solidified metal, metallurgy process gas, liquid metal absorbs gas steel manufacturers, or welding flux generated by the decomposition of wet gas at high temperatures, or even too much humidity in the welding environment will decompose at high temperature gas, etc. These gases late precipitation When will form porosity defects. Although compared to other porosity defects stress concentration trend is not so big, but it destroys the weld metal density, reducing the effective cross-sectional area of ??the weld metal, resulting in reduced strength of the weld. Steel Works factory in Dongguan, Shenzhen, steel manufacturers, steel structure built by Peng Peng Jian Steel Co., Ltd., Dongguan City. Steel Co., Ltd., Dongguan City, Peng Jian (dgpengjian.cn) strong, credible, in Dongguan, Guangdong steel industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Peng built into the brilliant steel and you work for a better future!