WELCOME TO OUR PRESENTATION

Explosion Welding

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.

Oxides found on material surfaces must be removed by effacement or dispersion

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.

Fig. Explosive Welding

Detonation velocity is a function ofExplosive typeComposition of explosiveThickness of explosive layer

WELDING PARAMETER

6

𝛒 = Plate densityV = charge velocity

 

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

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.

• 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).

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.

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.

Examples

Examples

3” Diameter AI/SS Ring Copper/Stainless 12” UHV Assembly

PRESENTED BY :

145009 MASHRUFA TANGINA NOSHIN145019 MD . ITTEHAD MUSTAKIM145029 SABHASACHI SAHA 145038 MD.MUSA KHAN145047 MD. TENVER SAHARIAR UTSO145056 JESMIN NAHAR JUI