Research On Affect Of Alloy Particle To Basic Electrode's Performance

To research the affects of minishing powder's size to basic low- hydrogen electrode performance, the medium carbon ferromanganese, ferro-silicon and ferro-titanium of different particles are added to the coating of E5015. The density, surface tension and viscosity of the coating are tested by RTW-10 fusant physical property colligation measuring instrument, and the affect of alloy granularity is researched. Assess the welding technics performance by the test of arc stability and the weldability feeling form welding worker. Assess the size-affects by collecting the molten drops with the d₅₀ collection method and measuring their sizes. The current and voltage waveforms are collected by Labview date collecting system, and the frequency and mode of molten drops transition are compared and analyzed. Use the 60 ton of universal material testing machines, the JB-30B impact testing machine to research the affects of different particles to deposited metal's mechanical properties respectively. Use microscope to observe the metal microstructure, and analyze the affects of different particles of powder to microstructure of deposited metal.Some conclusions are gained from the research. Adding thin powder can increase interfacial tension of slag, and get thinner molten drop and high transition frequency of molten drops. Adding nano ferro-titanium can make Mn transition preferably, get thinner ferrite grains, the acicular ferrite content and impact ductility of deposited metal are increased. Nano ferro-silicon is available to get stable arc and high hardness. Nano medium carbon ferromanganese can only make the molten drops thiner. It is bad to other performances of electrode. When nano ferro-titanium and nano ferro-silicon exist at the same time, the weldability and molded competence are good, the welding technics performance is excellent, and the deposited metal can get good impact ductility, high hardness at the same time and thin ferrite grain.