In the industrial production of titanium and titanium alloy, both the consumable electrode remelting or forging blank, or different castings, mostly by vacuum consumable electrode arc smelting.
With the development and progress of modern technology, the titanium and titanium alloy smelting, including vacuum consumable electrode arc smelting, successively developed some new advanced technology.
Representative technology in recent years is as follows: 1, directly add high melting point metal titanium alloy vacuum consumable smelting with electrode preparation method in vacuum since the electricity arc smelting with titanium alloy electrode, on the basis of conventional preparation by the direct suppression of certain grooves of the electrode block and is suitable for the high melting point metal rod electrode block groove shape of welding electrode method, by choosing appropriate vacuum since the electricity arc melting process, can achieve melting the matching calculation requirement, composition of even without segregation quality of ingot casting.
2 vacuum consumable, titanium and titanium alloy smelting process interruption electric arc starting again after the process of titanium and titanium alloy vacuum since consumption of smelting process again after interrupting electric arc process, including the following steps: when arc starting again after the interruption of smelting, melting current rapid ascension to 75 - the normal melting current
80%, keep the melting current;
When the edge of the molten pool reaches the crucible wall, keep 2 -
3 min, then melting current rapid ascension at this time to normal smelting electric current.
The technology advantage, make the total arc starting time shortened significantly, reduce the cooling of the ingot after the volume shrinkage and the crucible wall between the gap and avoid the formation of ingot solidification cooling internal shrinkage: when melting current reaches 75 to 80% of normal melting current, keep the melting current for a period of time, so that we can more accurately control electrode and has solidified melt velocity of molten pool, avoid instantaneous produces large amounts of liquid and flows into the clearance between the crucible wall and ingot casting, or cause cold insulation defects.
3, pure titanium massive scrap melting recycling method of pure titanium massive scrap melting recycling method, using six gun electron beam cooling bed furnace, the raw material for the selected component into the feeder, electron beam cooling bed furnace for melting, cooling, and then will get ingot can be finished.
The TA1 recycling materials directly used for smelting, avoid the waste broken electrode block, electrode welding system.
Single ingot melting every single device can smelting nine bar stock total weight about 6.
5 tons, the double ingot melting every single device can be the total weight of smelting 18 bar about 13 tons, greatly improve the recovery efficiency and speed.
4, titanium and titanium alloy scrap waste of the electron beam cooling bed smelting waste recycling method of titanium and titanium alloy crumbs shape of the electron beam cooling bed melting recycling method, the process is: according to the melting titanium and titanium alloy composition, weigh and pure titanium scrap waste, waste or weigh and pure titanium chip shape and the titanium alloy scrap waste one or two of pure alloy and titanium sponge and add elements and/or intermediate alloy mixed mixture, the mixture of pure titanium and titanium alloy scrap form waste percentage content in accordance with the quality plan is 10% ~ 90%;
Then compressed into the electrode, cooling bed by the electron beam melting furnace
electrode block will be stated on a cooling bed of the electron beam melting, titanium or titanium alloy ingot casting.
This method can be used as much as 100% pure titanium scrap waste to produce qualified pure titanium ingot casting, or use as much as 90% titanium and titanium alloy scrap waste, to produce qualified casting titanium alloy;
Only need a smelting electron beam cooling bed, don't need two or three times smelting.
5, pure titanium and titanium alloy ingot melting method of pure titanium and titanium alloy ingot melting method, the method is: according to take titanium sponge or take pure alloy elements added, intermediate alloy and titanium sponge and titanium sponge or pure alloy mixture to add elements, intermediate alloy and titanium sponge pressed into the electrode block, will be pressed into the electrode piece of welding electrode, using electron beam cooling bed furnace electrode for an electron beam cooling bed smelting, get clean, uniform chemical composition of titanium or titanium alloy ingot;
Electron beam cooling bed of smelting smelting vacuum below 6 x 10 -
2 pa, melting speed is 70 ~ 150 kg/h, melting is 100 ~ 300 kw power;
Pure alloy elements added and the total weight of intermediate alloy titanium alloy ingot of 0% ~ 20%.
Production of titanium and titanium alloy ingot, chemical composition, macrostructure ingot casting is better than that of vacuum since the electricity arc smelting ingot, TiN and WC high melting point inclusion.
6, containing high melting point alloy element titanium alloy melting method with high melting point alloy element titanium alloy ingot industrialized preparation methods.
By selecting the alloy material, USES the special spellers electrode block, the conventional vacuum since the electricity arc smelting technology, adjust the three melting current and voltage, the preparation of uniform chemical composition, without containing high melting point alloy elements of the inclusion of titanium alloy ingot casting.
High melting point metal distributed evenly in the consumable electrode, consumable electrode convenient preparation, low cost, reasonable smelting as current, voltage parameters, on the basis of traditional craft route, using a low-cost pure metal plate according to the specific consumable electrode spellers way, instead of adding the high cost in the middle of the alloy and pure metal to join other titanium alloy, several times with the vacuum arc furnace for melting power consumption for uniform composition containing high melting point alloy element titanium alloy ingot casting, suitable for industrial application.
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