Welding performance of hot rolled non-standard steel for coal machine
(GB/T3414-1994)
Due to the rapid development of coal industry, the requirement for coal machine is more and more higher. Hot-rolled non-standard steel for coal machine (GB/T3414-1994) is the main material which used in this industry. Hot-rolled non-standard steel for coal machine is one kind of steel which used as components to coal machine. In order to build a top-class coal machine, its of great importance to know the welding performance of this type of steel.
First and foremost, hot rolled non-standard steel for coal machines features strong strength and good durability, which provides a reliable guarantee for its welding performance. Meanwhile, its chemical composition and mechanical properties are completely consistent with GB/T3414-1994 standards, moreover, the process of heat treatment for this material is also designed as per GB/T9439-1994 standard. This also does a good job in ensuring the stability of welding performance.
In addition, carbon elements play a significant role in hot rolled non-standard steel for coal machine (GB/T3414-1994). It contained the specified amount of carbon elements needed for welding. Thus, its weldability can be greatly improved by applying the practice of pre- and post-heating for welding. Preheating and post-heating can reduce the hardening caused by the welding heat, lower the welding stresses and effectively prevent the warpage, cracking and brittleness.
At the same time, its also extremely important to pay attention to the welding gap. For hot-rolled non-standard steel for coal machine, the welding gap should be determined as per its welding parameters, i.e., whether high or low current is adopted. If high current is used, then the gap should be a little wider than that of welding with low current. Otherwise, the joint will easily cause cold fusion, pores and slag inclusion.
Moreover, when welding hot-rolled non-standard steel for coal machine, its necessary to take into account the type of welding wire. Because different welding wires have different performance and welding requirements. Therefore, its better to choose the welding wires that with good welding performance and strength.
Last but not least, the surface of hot rolled non-standard steel for coal machine must also be ensured. If the surface is too rough, it can substantially reduce its welding performance, thus, surface preparation and grinding should be carried out prior to the welding.
In conclusion, proper welding for hot-rolled non-standard steel for coal machine (GB/T3414-1994) requires specific attention to its welding parameters and pre-and postheating. Moreover, the selection of welding wire and the surface preparation are also important. Therefore, comprehensive consideration should be taken in order to guarantee its favorable welding performance.
