Explosionwelding
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Explosive welding is a solid-state process that joins dissimilar metals through high-velocity impact using controlled explosions. It produces strong welds without heat effects or microstructural changes common in other welding methods. The explosive material is placed between the metals to be joined and detonated, driving one metal into the other at velocities over 4500 m/s to form a metallurgical bond. Explosive welding can join materials like aluminum to steel that are difficult to weld through other methods. It has applications in industries like petroleum refining, shipbuilding, and aerospace for cladding, sealing, and repairing parts.
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Explosion welding - Nikhil
Explosion welding is a solid-state process that produces a high velocity interaction of dissimilar metals by a controlled detonation.
Explosion welding
One of the welding processes that used in Engineering field is the explosion welding. There are several types of welding processes similar to this, but explosion welding has its unique features.
Thanks for the colleagues who give this slides to publish.
Cold welding
Cold welding is a solid-state welding process that uses pressure at room temperature to join metals through substantial deformation without melting. Both butt and lap joints can be formed. At least one metal must be ductile and heating is not applied. Surface preparation is important. The parts are cleaned, sheared, clamped in a die, and a forging force is applied to complete the weld. Advantages include no thermal effects on materials and a simple, fast, inexpensive process. Inspections can be difficult and some processes reduce part thickness. Common applications include wire drawing and sealing of heat-sensitive devices.
EXPLOSION / EXPLOSIVE WELDING
Explosion welding is a solid-state process that produces a high velocity interaction of dissimilar metals by a controlled detonation.
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The document discusses explosion welding, which uses a controlled detonation to join dissimilar metals at high velocity. It has advantages over conventional welding like minimizing heat-affected zones and melting. The process involves detonating an explosive between a base component and cladding metal, using a flyer plate and anvil. Parameters like explosive type and thickness affect the detonation velocity. Explosion welding has applications in various industries for tasks like pipe welding. A brief history is also provided.
Introduction to solid state welding processes
Welding joins metals through different ways. From arc to oxyfuel, there are various techniques to fasten metal pieces together to create unique products.
Contrary to popular belief, not all welding processes have to melt the metal. One such way of forming metal pieces without increasing the temperature is through solid-state welding, and there are different techniques under this branch too. Here are some of them:
Diffusion welding
Diffusion welding is a solid state welding process that joins materials together without melting through the application of pressure and heat. It is commonly used to join refractory metals at temperatures just over half their normal melting point. Close tolerances and a protective atmosphere are required to accomplish the welding. The process is considered diffusion brazing when a filler material is placed between surfaces before joining. Diffusion bonding results from atomic diffusion and plastic deformation at the interface between surfaces. It is used for joining dissimilar metals and composites in applications like aerospace and nuclear industries.
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Explosion welding - Nikhil
Explosion welding is a solid-state process that produces a high velocity interaction of dissimilar metals by a controlled detonation.
Explosion welding
One of the welding processes that used in Engineering field is the explosion welding. There are several types of welding processes similar to this, but explosion welding has its unique features.
Thanks for the colleagues who give this slides to publish.
Cold welding
Cold welding is a solid-state welding process that uses pressure at room temperature to join metals through substantial deformation without melting. Both butt and lap joints can be formed. At least one metal must be ductile and heating is not applied. Surface preparation is important. The parts are cleaned, sheared, clamped in a die, and a forging force is applied to complete the weld. Advantages include no thermal effects on materials and a simple, fast, inexpensive process. Inspections can be difficult and some processes reduce part thickness. Common applications include wire drawing and sealing of heat-sensitive devices.
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Explosion welding is a solid-state process that produces a high velocity interaction of dissimilar metals by a controlled detonation.
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The document discusses explosion welding, which uses a controlled detonation to join dissimilar metals at high velocity. It has advantages over conventional welding like minimizing heat-affected zones and melting. The process involves detonating an explosive between a base component and cladding metal, using a flyer plate and anvil. Parameters like explosive type and thickness affect the detonation velocity. Explosion welding has applications in various industries for tasks like pipe welding. A brief history is also provided.
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Welding joins metals through different ways. From arc to oxyfuel, there are various techniques to fasten metal pieces together to create unique products.
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Diffusion welding
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This document discusses welding defects and welding processes. It describes various types of welding including arc welding, gas welding, resistance welding, thermit welding, solid state welding, and newer welding techniques. It then discusses common welding defects such as slag inclusion, undercut, porosity, incomplete fusion, overlap, underfill, spatter, excessive convexity/concavity, excessive weld reinforcement, incomplete penetration, and excessive penetration. For each defect it provides the potential causes and recommendations for prevention and repair.
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Soldering and brazing are metal joining processes where a filler metal is melted and drawn between closely fitted metal pieces through capillary action to form a permanent bond. Brazing differs from soldering in that the filler metal has a higher melting point above 450°C, while soldering uses filler metals with lower melting points. Common brazing methods include torch, furnace, dip, and induction brazing, while soldering is typically done with an iron or through wave soldering of printed circuit boards. Brazing and soldering offer advantages over welding like joining dissimilar metals, lower temperatures, less distortion and damage, and faster joining.
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Welding is a process that joins materials by causing coalescence and can be accomplished with or without the use of filler material. There are several common welded joint types including butt, fillet, lap, and corner joints. Various welding processes are described including oxy-fuel welding, shielded metal arc welding (SMAW), gas metal arc welding (GMAW), and gas tungsten arc welding (GTAW). Key factors that affect the quality of a weld include current, voltage, travel speed, and gas selection depending on the specific process.
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Advanced welding processes by Hamid Taghipour Armaki
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Explosionwelding
- 2. Introduction Principle of Explosion Welding Salient Features of Explosion Welding Explosives Materials Advantages & Disadvantages Applications Contents
- 3. Explosion welding is a solid-state process that produces a high velocity interaction of dissimilar metals by a controlled detonation. Introduction This eliminates the problems of heat effects & micro-structural changes (as in fusion welding). Oxides found on material surfaces must be removed by effacement or dispersion Fig. Explosive Welding
- 4. Principle of Explosion Cladder metal can be placed parallel or inclined to the base plate. Explosive material is distributed over top of cladder metal. Upon detonation, cladder plate collides with base plate to form weld. Waves are generated so due to mechanical bonding joining takes place. A single detonation cap can be used to ignite the explosive.
- 5. Placement of Cladder metal-parallel Standoff distance predetermined and unique to material combination • Achieved by placing shims between plates • Shims designed to be consumed by explosion wave and do not affect weld Usually ranges between 0.5-2 times the thickness of cladder plate Cladder must reach critical velocity before impact
- 6. Salient Features The high velocities are promoted by carefully detonated explosives. The process can be done in vacuum to reduce sound & blast. Typical impact pressure are millions of psi. Well suited to metals that are prone to brittle joints when heat welded such as, • Al on steel • Ti on steel
- 7. Typical explosive forms • Plastic flexible sheer • Cord • Pressed shapes • Cast shapes • Powder/granular Detonation velocity is a function of • Explosive type • Composition of explosive • Thickness of explosive layer
- 8. Assuring a Good weld Three types of Detonation wave welds: • Shock wave develops if sonic velocity is greater than 120% of material sonic velocity (type 1) • Detached shock wave results when detonation velocity is between 100% and 120% of material sonic velocity (type 2) • No shock wave is produced if detonation velocity is less than material sonic velocity (type 3)
- 9. Explosive material High velocity (4572-7620 m/s) • Trinitrotoluene (TNT) • Cyclotrimethylenetrinitramine (RDX) • Pentaerythritol Tetranitrate (PETN) • Datasheet • Primacord Mid-low velocity (1524-4572 m/s) • Ammonium nitrate • Ammonium perchlorate • Amatol • Nitroguonidine • Dynamites • Diluted PETN
- 10. Advantages of Explosion Welding • Very large work pieces can be welded. • (Al + Steel) materials can be welded. • Can bond many dissimilar, normally unweldable metals. • Material melting temperatures and coefficients of thermal expansion differences do not affect the final product. • Process is compact, portable, and easy to maintain.
- 11. • Welding can be achieved quickly over large areas. • No need for surface penetration. • Backer plate has no size limits. • Inexpensive. • The strength of the weld joint is equal to or greater than the strength of the weaker of two metals joined. • No heat-affected zone (HAZ).
- 12. Disadvantages of Explosion Welding • Metals must have high enough impact resistance and ductility • The geometries welded must be simple-flat, cylindrical, conical • The cladding plate can’t be too large • Noise & blast can require worker protection, vacuum chambers, buried in sand/water.
- 13. Applications • Cladding of base metals with thinner alloys e.g. cladding of Ti with mild steel. • Seam and lap welds. • Reinforcing aerospace materials with dissimilar metal ribs. • Heat exchangers. • Tubular transition joints. • Used as a repair tool for repairing leaking tube-to- tube sheet joints. • Spot welding. • Flat plates. • Joining of pipes in socket joints.
- 14. Common industries that use Explosion Welding • Petroleum Refining • Chemical Processing • Hydrometallurgy • Aluminum Smelting • Shipbuilding • Electrochemical • Oil & Gas • Power Generation • Cryogenic Processing • Pulp & Paper • Air conditioning & Chillers • Metal Production
- 15. Examples
- 16. Examples 3” Diameter AI/SS Ring Copper/Stainless 12” UHV Assembly