Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1982-12-21
1984-11-06
Albritton, C. L.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
B23K 2500
Patent
active
044814003
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to welding production, and particularly to electroslag welding of light metals whose density is lower than that of a flux, to a forming device for practicing said method, and to a flux utilized in this process.
BACKGROUND ART
Known in the art is a method of electroslag welding of light metals, consisting in successively mounting parts to be welded, with a desired gap therebetween, a forming device, and an electrode (USSR Inventor's Certificate No. 764,902). Following this, the gap between the edges to be welded is filled with a flux, leaving the electrode end extended over the flux surface, and a slag pool is set up. Then the welding current is switched on. As the volume of the slag pool increases, the bottom portion thereof is lowered while exposing new portions of the electrode for melting. In the process of welding the electrode is melted from above downwards, while liquid metal formed as a result of melting the electrode and the slag pool are kept within the gap. After the complete melting of the electrode and fusion of the edges of the parts to be welded, the welding current is disconnected. Metal is solidified within the gap thereby forming a weld.
A device for practicing this method comprises side moulds, a container disposed above the edges to be welded, and a container disposed under said edges. The upper container is defined by the side moulds and bars mounted on the parts to be welded. The lower container in defined by the side moulds and bars mounted under the parts to be welded. The lower container further comprises a tray retaining the flux and the weld pool within the gap.
The weld obtained by the prior art method with the use of the above device possesses insufficiently high performance properties due to incomplete degassing of the weld metal. In the utilization of the above device the setting of the slag pool is also impeded.
Known in the art is a halide-based flux (U.S. Pat. No. 3,585,343), containing in percent by weight:
______________________________________ potassium chloride 45
sodium chloride 27
cryolite (3NaF.AlF.sub.3)
22
lithium chloride 6
______________________________________
Said flux makes it possible to carry out a stable process of electroslag welding, reduces well the oxide film on the welded parts. However, the weld obtained with the use of said flux in the process of welding, is porous and contains an increased amount of gases, thereby resulting in the sharp decrease in mechanical characteristics of welded joints.
DISCLOSURE OF INVENTION
The object of the invention is the provision of a method of electroslag welding of light metals, a forming device and a flux, permitting, by changing process parameters, structural arrangement and by qualitative variation of the flux, the provision of monitoring the composition and structure of the weld metal, thereby upgrading performance characteristics of the weld.
The object set forth is attained by the fact that in a method of electroslag welding light metals, comprising successively mounting parts to be welded, providing a desired gap therebetween, a forming device and an electrode, filling the gap with a flux and setting up a slag pool followed by melting the electrode and the edges to be welded with the formation of a metal pool which is accumulated, maintained in the liquid state and utilized to fill the weld gap with the liquid metal with subsequent solidification of the liquid metal, according to the invention, the metal pool is accumulated outside the gap above the edges to be welded, and filling the gap with the liquid metal is accomplished after the fusion of the electrode and the edges of the parts and accumulation of the pool in the amount required for filling the gap considering weld reinforcement.
The method allows the performance characteristics to be improved due to a practically complete degassing and refining of the weld metal during the accumulation of the metal pool outside the gap above the edges to be welded.
The metal pool is recommended to be add
REFERENCES:
patent: 2789074 (1957-04-01), Miller
patent: 3585343 (1971-06-01), Crichton
patent: 3610867 (1971-10-01), Bartle
patent: 3710068 (1973-01-01), Calton et al.
patent: 4207454 (1980-06-01), Safonnikov et al.
Antonov Anatoly V.
Safonnikov Anatoly N.
Albritton C. L.
Sigda Catherine M.
LandOfFree
Method of electroslag welding of light metals, forming device an does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of electroslag welding of light metals, forming device an, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of electroslag welding of light metals, forming device an will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1043509