Why are there too many impurities in the gravity casting products of aluminum alloy, so they can not be welded well by argon arc welding?
The official must before casting of aluminum liquid refining slag and gas, because the melting use graphite crucible furnace or silicon carbide crucible furnace refining, so do not suggest that the addition of a solvent in order to avoid corrosion of crucible, the best refining slag degassing process is the use of rotary degassing machine by introducing inert gas such as nitrogen and argon (the best), impurity and hydrogen in liquid aluminum removal, complete slag removal and gas to test the effect of slag by K model, and use the detection instrument for measuring hydrogen hydrogen content, to meet the requirements after the investment casting used.
The filter is not added in the casting process, some slag ran in, leading to the casting surface or internal slag, leakage or air pressure testing, due to impurities, argon arc welding welding is up to where there is always staying, not fusion. The solution, first of all to choose high purity aluminum ingots, some rural plant products do not choose, are turning or cutting scrap materials in investment, not too many impurities; secondly in the casting process, increase to two times to minimize the filtering impurities.
1. to improve the gating system, an open gating system must be used.2., strengthen the refining process of aluminum liquid, fully let the slag in the aluminum liquid separate out.3. as far as possible the use of low temperature pouring.If it's convenient, I can help you with the craft.
