How to use pure nickel welding rod for cold spark surface repairing in casting purpose
Why need to do the casting surface repairing by cold spark technology?
a. At present, with the development of industry, more and more high-end precision molds are being put into use, and it is inevitable that during the continuous use of molds .Damage to the mold, such as wear, scratches, pinholes, cracks, and defects, may occur.
b. To a certain extent, the repair equipment helps customers repair molds to save costs. But it's also unavoidable.Some problems may occur, such as mold deformation, reduced hardness, internal stress, and sand caused by repairing the mold Eyes, injuries, and even scrapping.
c. Precision mold repair cold welding machine is a non heat overlay welding process that ensures the integrity of the mold. It can also use the strengthening function to strengthen the mold, achieving wear resistance, heat resistance, corrosion resistance, and so on.
How to achieve the surface repairing by cold spark technology?
When the electrode rod (welding rod) rotates on the working surface and the gap between certain parts is small, it causes the main engine to discharge the circuit
Form a pathway. Instantaneous current flows through the small areas where they come into contact with each other and the current density can reach 105~106/cm2, while the discharge time is only 10-6~10-5 seconds, due to the high discharge energy in terms of time, space, and space concentration of temperature generated a high temperature of about 80000-10000C in the small discharge area, causing localized damage to the area The material undergoes high-energy ionization, and the electrode rod (electrode) is rapidly transferred to the surface of the workpiece in a plasma metallurgical state,and it diffuses into the surface of the workpiece, forming a deposition layer of metallurgical vehicle solid bonding.
c.The discharge cycle of the host power supply is 10-1 seconds, high-frequency discharge and high-speed rotating scanning of electrode rods (welding rods) on the surface of the workpiece,can achieve large-area and high-efficiency deposition coatings.
3.Why can the "cold welding" technology achieve the surfacing repairing (low heat input)?
This is because the discharge time (Pt) is shorter than the discharge interval time (It), and the discharge interval period
The heat quickly diffuses to other parts of the workpiece, so the heat will not be concentrated in the processing part of the workpiece The true meaning of cold welding now.
4.What are the cold welding application ?
1. Widely used for repairing corrosion and strain on machine tool guide rails.
2. Repair of scratches and bumps on the printing machine drum
3. Repair of hydraulic rod strains and scratches
4. Repair of motor rotor wear
5. Repair of crankshaft strain and wear
6. Repair of cylinder liner and cylinder block wear
7. Casting defects such as valve body, pump body, flange, brake disc, brake hub, etc., corrosion repair.
8. Impeller and drill surface strengthened with tungsten carbide.
9. Repair of defects on machining and non machining surfaces of various non-ferrous metal castings such as cast aluminum and cast magnesium
5. What materials do you have for for cold spark surface repairing in casting purpose?
We have the pure nickel welding rod for cold spark surface repairing
Nickel welding Tig rod
Ni99% - N6
Size : 1/8" X1meter
Characters : no flux coating or inside
Chemical composition :
|
C |
Si |
S |
P |
Mn |
Ni+Co |
Cu |
Mg |
Fe |
|
≤0.10 |
≤0.10 |
≤0.005 |
≤0.002 |
≤0.05 |
≥99.50 |
≤0.10 |
≤0.10 |
≤0.10 |
|
0.006 |
0.04 |
0.002 |
0.001 |
0.02 |
99.81 |
0.001 |
0.02 |
0.07 |
