Finished joint connections as follwing:

Operation Process

Special List

Exothermic Welding

Exothermic welding is a simple, effective , quality welding method ,which weld the parts to desired size and type in graphite mould cave with overheat melting .

Currently ,the exothermic welding replaced mechanical connection widely .

Brief of exothermic welding

We offer the perfect welding solution comply with your project .

Generally ,the welding solution is consist of following portions :

Exothermic welding mould:The mould is made of quality graphite body to obtain the perfect seal and lasting performance .The life of our mould can be 80-100 joints ,which is more lasting than other competitor’s

Exothermic welding powder: We mix the powder comply with your conductor’s material and size with reasonable ratio ,so the joint is more strong and more lasting.

Tool box: We offer the full sets tools to meet your demand ,including ignition gun ,brush ,wrench ,screwdriver and glove . It is a package box to meet your whole demand.

Characters of Bailijia Exothermic Welding :

l 1).Good current loading ability:The welding point current loading ability is same to that of conductor;

l 2). Good mechanical performance: The connection is a molecular connection. It is a permanent connection ,no loss or corrosion result to high resistance;

l 3). Stable dash current resistance: The test shows that in the surge of big current in short time, and the conductor melts earlier than the connection point, no damaged by surge current.

l 4). Good resistance to corrosion: The welding joint is covered by copper and more strong than copper, it provides good resistance to corrosion.

l 5). Simple and safe connection: Neither outside power nor facility is required. It take very little time to finish one welding both indoor and outdoor.

l 6). Free control the reaction temperature: Different welding powder is provided according to the metal features, so the welding powder can be very solid.

Biref of exothermic welding ,welding powder and joint

Exothermic welding by aluminothermic reaction generated by high temperature to make completely molten metal.

The character of electric earthing system require the material must be low resistance and anti-corrosion ,so the metal oxide in the welding powder is copper oxide .

Physical properties of welding powder

Thermitmetal welding powder is deep dark metal particles mixture ,no smell in sun ,stable ,no emission in common temperature . The flame point is 480 degree and ignited with phyrophoric powder or magnesium rod .

Chemical composition of welding powder

The main content of welding powder are copper oxide and aluminium .The recipe of welding powder must be safe and economical ,for example ,the reaction speed of copper oxide and aluminium is fast and burst ;Boiling pointed of some restored metal is too low(melting point of aluminium is 660 ℃,that of copper is 1 084 ℃);melting point of aluminium is too low to weld well ect .

On the other hand ,the recipe of welding powder depends on the welded material ,joint type ect ,so much test is required .Currently ,the welding powder is safe and harmless ,and the recipe are as below:

Main content and ratio of welding powder

Physical properties of joint

Properties of joint

Resistance of joint

Strength of joint

Store of exothermic welding powder

Store instruction :The flame point of powder is very high ,so pyrophoric powder is must to ignite, the store condition should be dry ,cool ,no shine ,no humidity.

If the packing damaged ,please don’t use

Packing

Strong packing is available and free of charge ,which is suitable for loading, storage in most popular condition .Custom packing will be charged reasonably to favor customer’s requirement .

Mould Packing: Air buddle film packing and carton, the additional wooden carton or wooden pallet protect the mould from broken when transportation.

Exothermic welding powder packing:PE bag indicating model, and the pyrophoric powder ,aluminium gasket contained. The additional carton box and wooden pallet protect the material.

Preparation for welding

l Graphite absorbs moisture. Ignite the propane torch and dry out the inside of the mold thoroughly on both sides, heating the mold .

l Use a soft cotton cloth or a soft bristle brush to clean inside the mold cavity and cover

l Check to ensure the graphite mold is not worn or broken, which could cause leakage of molten weld metal during the reaction.

l The clamp is used for open-closing mould ,so the tightness of clamp is very important to the welding quality ,please carefully check and adjust the clamp before welding as following:

(a)Keep the clamp open

(b)Loosen the fixing buckle of clamp

(c)Pick out gim peg

(d)Adjust the regulating screw and contrarotate (Loosen )

(e)Pin the gim peg and buckle

(f)Open clamp and check the result

l Close the grips to tightly lock the mold. Check for an appropriate seal on the mold. If the mold does not seal properly, make adjustments to tighten/loosen the handle clamp.

l The mould is made of graphite and very gentle ,so don’t throw or impact .Meanwhile the mold must be correct for the conductor size and application. Don’t remove the residue with hard tool

l If the conductor size is smaller than specified ,there will be copper liquid omitting .The following remedy for reference :

(1)Use proper thickness copper pipe or copper bush

(2)Use copper piece or copper tape

(3)Use seal

(4)Use Pyrocotton tape

The life of mould can be 50-100 times if protected according to the above items.

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Operation Instruction

l Check to ensure the graphite mold and conductor is clean ,no residue before making the connection

l Use a propane torch to dry wire conductors and remove remaining cleaning residue, solvent, or water before making the connection.

l Close the graphite mold lid before ignition ,and close the lid tightly

l Insert the conductors and position them for the connection.Ensure them in the center of cavity.

l Keep the irrelevant personnel 1.5M away when welding

l Keep the inflammable goods 1-2M away when welding

l The operator must be equipped thermal barrier glove

l Don’t face to the mould opening when welding

l The operator keep 1.5M away mould is must after ignition

l Don’t touch the mould and connected parts directly after welding

l Open the mould and take the joint out with wrench 10-20S later after reaction .

l Insulate the joint after the conductor cooling completely .