1、consider the weld metal mechanical properties and chemical composition For ordinary structural steel, usually require the weld metal and base metal strength, should be used to weld metal tensile strength equal to or slightly higher than the base metal electrode. For alloy structural steels, alloy compositions are sometimes required to be the same or close to the base metal. In the welding structure of large rigidity, joint stress is high, easy to produce cracks in the case of cracks, should consider the use of lower strength than the base metal electrode. When the base material of carbon, sulfur, phosphorus and other elements of high content, the weld prone to crack, should use good cracking resistance of alkaline low hydrogen electrode. The same time as
2、consider the use of welding components and operating conditions to bear the load and impact load of the weldment, in addition to meet the strength requirements, the main should ensure that the weld metal has a high impact toughness and plasticity, optional plastic, toughness indicators higher low Hydrogen electrode. Contact with corrosive media welding parts, should be based on the nature of the media and corrosion characteristics of stainless steel electrode or other corrosion-resistant electrode. In high temperature, low temperature, wear or other special conditions of work of welding parts, should use the appropriate heat-resistant steel, low temperature steel, welding or other special purpose welding rod. The same time as
3、consider the characteristics of welding structure and stress conditions on the structure of complex shape, large rigidity of the welding parts, due to the welding process to produce a large internal stress, easy to make cracks in the weld, should use good cracking resistance of alkaline low Hydrogen electrode. On the force is not, the welding parts difficult to clean the weld, should be used on the rust, oxide, oil is not sensitive to the acidic electrode. For welding parts that can not be reversed by conditional restrictions, electrodes should be used for all-position welding. The same time as
4、consider the construction conditions and economic benefits to meet the performance requirements of the use of the product, should use a good process of acid electrode. In the case of small or poor ventilation conditions, should use the acidic electrode or low dust electrode. For the welding of large workload, the conditions should be used as far as possible the use of high efficiency electrode, such as iron electrode, high efficiency gravity electrode, or use the bottom of the electrode vertical welding electrode like to improve the welding productivity.
Contact Us
Whatsapp:+8615988407388
TEL NO:0571-87169872/87169873
FAX:+86-571-87169573
EMAIL:exporting02@hzdayang.cn
Web:www.hzdayang.com/ www.dayangwelding.com
