Presentation is loading. Please wait.

Presentation is loading. Please wait.

Non-Arc Welding Processes Resistive heating, chemical reactions, focused light and electrons, sound waves, and friction can also be used to join materials.

Similar presentations


Presentation on theme: "Non-Arc Welding Processes Resistive heating, chemical reactions, focused light and electrons, sound waves, and friction can also be used to join materials."— Presentation transcript:

1 Non-Arc Welding Processes Resistive heating, chemical reactions, focused light and electrons, sound waves, and friction can also be used to join materials –Resistance welding –Oxy-Fuel Welding –Friction welding (&Solid State) –Laser and electron beam welding –Brazing and soldering –Plastics joining –Adhesive bonding Introduction

2 Brazing (B) and Soldering (S) In these processes, the base metals are heated but do not melt; only the filler metal melts –Brazing filler metals having a melting point above 840° F (450°C) –Soldering filler metals have a melting point below 840°F (450°C) Brazing and Soldering

3 T

4 Application of Low Thermal Expansion Alloys Thermal expansion mismatch in metal- ceramic joints can lead to cracks in the ceramic Thermal expansion coefficients at 25°C (10 -6 mm / mm·°C) –Alumina, 8.8 –Nickel, 13.3 –Iron, 11.8 –Kovar, 5.0 Alumina substrate Kovar lid Silicon chip Brazed joints T

5 Brazing Specifications AWS A5.8 Specification for Brazing Filler Metal –8 well-defined groups (B) plus a vacuum grade (BV) BAg-1(44-46 Ag, Cu, Zn, Cd) BAu-1(37-38 Au, remainder Cu) BCuP-1( P, remainder Cu) –Standard forms: strip, sheet, wire, rod, powder –Joint design tolerances, generally ~ inches –Uses for each braze material AWS C3.3 Standard Method for Evaluating the Strength of Brazed Joints Brazing and Soldering

6 Balchin & Castner, “Health & Safety…”, McGraw Hill, 1993

7 Advantages Joins unweldable materials –Base metals don’t melt –Can be used on metals and ceramics Joined parts can be taken apart at a later time Batch furnace can easily process multiple parts Portable when joining small parts Brazing and Soldering

8 Limitations Joint tolerance is critical Lower strength than a welded joint Large parts require large furnaces Manual processes require skilled workers Flux Filler metal ring surrounded by flux Brazing and Soldering


Download ppt "Non-Arc Welding Processes Resistive heating, chemical reactions, focused light and electrons, sound waves, and friction can also be used to join materials."

Similar presentations


Ads by Google