Specifications:
Graphite Block and graphite plate are two kinds of graphite products,used in precision tools,aerospace industry,smelt,etc.
Graphite Block is used in precision tools,aerospace industry,war industry chemical industry,smelt,etc.and its annual output capacities reach to 10.000tons.The products can be made into graphite heater,graphite tool,graphite bearing ,graphite crusible,graphite heating elements for vacuum furnace,graphite heating pipe for vacuum furnace,graphite furnace nail,graphite trestle,graphite tool for diamoud,etc.
Item | Unit | Spec |
GSK-XC | TSK-XC | PSK-XC |
Bulk density | g/cm3 | ≥1.74 | ≥1.71 | ≥1.62 |
Bending strength | Mpa | ≥14.5 | ≥13.5 | ≥8 |
Compressive Strength | Mpa | ≥32 | ≥30 | ≥28 |
Electric resistivity | µΩ·m | ≤8 | ≤8 | ≤9 |
Max grain | mm | 0.8 | 2.0 | 2.0 |
CTE(100-600) | 10-6 /oC | ≤2.5 | ≤2.5 | ≤2.3 |
Block Sizes (mm) | 332x150x2200,350x175x2100,500x200x1800, 500x200x2500,520x200x2000,550x250x1800, 550x250x2500,400x400x1800,500x500x1800, 500x500x2000,530x530x2000,600x200x1830, 650x400x1800,850x300x1800,850x400x1850 |
|
Rods Sizes(mm) | Φ400-Φ1200 x 300-500, Φ100-Φ550 x 1800 |
Brief introduction:
Exothermic welding mould made of high purity graphite used for grounding exothermic welding welding head forming.A complete mold made of concrete, roof, hinge.
Main performance:
Fine workmanship, unique design, excellent performance, with long time;The operation is simple, does not require an external power source and heat source, the welding of low cost, stable and reliable quality.
Use scope:
Very suitable for field welding cable and other metal components, is suitable for the cathodic protection system installation in the process of copper core and the connection between the steel structure welding or copper cable.
Exothermic welding - basic classification
A heat flux, copper conductor.It USES metal compounds chemical reaction heat as a heat source, through the (reduction) molten metal overheating, direct or indirect heating work, in a special graphite mould cavity form a certain shape, size, the welded joint meets the engineering requirements.The chemical equation is expressed as:
M O + Al = = = = = M + AlO + high temperature (including M for metal available)
2, aluminum conductor thermit welding, also called charge welding.Not only can charge welding welding area 3-240 - mm 2 aluminium conductor, also can welding aluminum bus bar sectional area 1000 mm 2.
Third, iron and iron connection, steel and steel connection, heat flux of iron and steel connections, such as rail welding.
The exothermic welding - advantages and application
1, the current-carrying capacity of the molten contact (melting) is the same as the conductor, has good conductivity, after the examination, the dc resistance ratio before and after welding rate close to zero.This is unmatched by any kind of traditional connection mode.
2, the welding point is molecules, permanent, not aging.
3, the welding point is not affected by corrosion as well as copper.
4, will not be high surge current.Test shows that under the impact of high current in a short time, ahead of fusion welding joint of conductor.
5, easy to operate, simple.Don't need a professional.
6, simple equipment, portable, easy to carry, easy to operate.
Compared with traditional mechanical connection technology, exothermic welding is the real molecules, conductor will not be destroyed and no contact, conductor interface overall effectiveness was not changed.
Exothermic welding - application field
• grounding and surge protection.
• electrical equipment grounding engineering processing.
• petrochemical engineering construction.
Construction, railway, highway, airport.
• intelligent building construction.
• cathodic corrosion protection.
Exothermic welding - steps
1, will die with conductor cleaning and drying;
2, connect to a conductor in the mould clamping, without gap;
3, will be at the bottom of the steel plate into the reaction chamber;
4, import, solder powder, then sprinkle with flash powder;
5, a small amount of flash powder on die lip, cover in mold cover;
6, using a special burning torch to ignite the fire powder;
7, solder powder reaction in high temperature resistance of mold;
8, wait several seconds, open the mold and clean the mold, to prepare for the next link;
The exothermic welding - use considerations
Before operation, construction, must make the pledge that we shall be weldments no dirt, inside the cavity and cavity die of molten great time left at welding welding slag block or welding slag powder.
Before the operation, must use the spray torch gas burner (or) drying by welding parts and casting, make it as far as possible do not contain water.
, construction operations, before ignition, must make the pledge that we shall cover the moudle cover, moudle and closed without slit.
, construction operations, before ignition, must make the pledge that we shall be weldments welding point is located in the center of the cavity.
, construction operation, the range of 1.50 meters, can not have irrelevant personnel to stay.
, construction operation, site within 1 -- 2 m, shall not put any flammable items.
, the operator must wear a heat insulation effect of working gloves.
Moudle, operating personnel do not face in the opening operation construction.
Once, ignition, the ignition powder is ignited, the operator must be at least 1.50 meters moudle to leave immediately.
, when the heat flux reaction ended, no direct contact with the casting and welding parts.
, when the heat flux reaction ended, moudle must stay and be hard weldments with natural cooling 10-20 seconds, use pliers (or similar tool) removed from the casting.
• insulation processing on the welding parts, must be conducted after wire cool completely before.
The exothermic welding - mold and the mold to the point
1, dry heating before using tool mould (e.g., drying box or torch), remove the moisture.For use at the end of the mold contains water, especially after the previous use of residue are still left in the mold, moisture more;
2, clean the mold, please use a soft brush or other soft material;
3, check the mold interface fit to prevent copper liquid leakage from the gap when working out.
4, mold clamp is used for opening and closing the mold, mold clamp close degree to influence the effect of welding, welding, please check carefully before started mold clamp, and make appropriate adjustment.Adjustment method is as follows: (a) the mold clamp in the open state (b) loosen the mold clamp fixed bolt lock (c) remove the fixed bolt (d) 5, adjusting screw, counterclockwise (loose) (e) inserted into the fixed bolt and lock (f), combining a model to observe the effect
6, installation, adjusting mold clamp, will die clamp fit with the mold fit to adjust to the best state;
7, exothermic welding mould made of graphite, is very fragile, cannot afford to throw and impact strength, should not speak more than mold plate as shown in the size of the welding material forced into the mold, or the use of metal material, hard tools to clean up scraps;
8, if the weld is smaller than the size of the mould plate, as shown in the following measures to avoid leakage of copper liquid cover (a) using the appropriate thickness of the copper sleeve (2) the use of copper or copper strip (3) use sealant (4) use cotton of high temperature zone;
9, graphite mould according to the above steps and maintenance, service life can reach more than 50-100 times;
Our advantages:
1. Entity factory, the cost is low
2. Advanced equipment, good quality
3. Accept small order
4. Delivery time is fast
5. Can choose mold clamp, welding powder, firing gun of a complete set of shipment (flash powder and gaskets for gift.
Feature:
1. Thermal stability: According to the quench acute thermal using conditions of graphite crucible, we will specially design the production procedure, so as to ensure the reliability of product quality.
2. Corrosion resistance: Even and fine basic design will delay the erosion of crucible.
3. Impact resistance: Graphite crucible can bear high thermal impact, so any process can be carried out.
4. Acid resistance: The adding of special materials will greatly improve the quality of crucible, especially its index of acid resistance., and will prolong the service life of graphite crucible.
5. High heat Conduction: High content of fixed carbon ensures the good heat conduction, shorten the time of dissolution, and remarkably reduce the energy consumption.
6. Control of metal pollution: The component of material under strict control will ensure that graphite crucible will not pollute the metals when dissolving.
7. Quality stability: The process technology of forming under high pressure and quality guarantee system will fully ensure the stability of quality
Graphite molds Materials index:
1.Content: 99.99%
2.Density: 1.87g/cm³
3.Compressive strength: 65mPa
4.Shore hardness: 55
5.Porosity: 15%
