Pejman Ronasi - Master of Metallurgy
Hassan Gholam Mogoei - Undergraduate student, Faculty of Mining Engineering and Metallurgy, Yazd University
Ali Karamzadeh - Undergraduate student, Faculty of Engineering, Shahrekord University
Ali Salehi - Master of Metallurgy, Azmouneh Foolad Company

In this research, the problems caused by the use of low quality steel belts in the strength and welding of steel structures have been investigated and evaluated. We know that a section of steel whose length and width are large is called a belt. They have different uses depending on the quality and size of the belt sheets. Features of the belts include good weldability and application in industries such as steel structures. Steel belts are produced and marketed in ۴ ways, which include climbing belts, fabric belts, machining belts and transformer belts. Production by machining methods, fabric and transformer due toeconomic and production limitations (need for high equipment and machining machines), less attention is paid to manufacturers and craftsmen. The sheets produced by these three methods have a smooth, polished surface and at the same time increase the quality of construction. The most common and optimal method of producing belt sheets is hot rolling. This type of belt, which is also known as smelting belt, has received more attention in our country from steel structures. The sheets available in the market sometimes do not meet the requirements of the type of material requested, in addition,they may be less strong and exist in accordance with chemical analysis in this type of sheets, but due to severe production and cracking in sheets with The thickness is higher. It was visible to the naked eye. In the results of ultrasonic test of welding belts in terms of experience, more defects and discontinuities such as non-melting of the wall compared to ordinary sheet is observed that one of the reasons for this is the presence of impuritiesin the structure of this type of consumables and the formation of layers known in There is an effect. When welding the welding line, the ultrasonic troubleshooter may make a mistake in detecting the location of the defects, in which case the non-destructive test will not reach the correct and reliable results.

Strip, Steel Structure, welding, Lamination