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Aluminum welding guide WELDING GUIDEBOOK WELDING TYPES AND TROUBLESHOOTING DIGITAL MICROSCOPE IMAGING EXAMPLES CWhat Is Welding Generally speaking welding refers to the method of melting metals to join them together There are multiple di ?erent methods of

WELDING GUIDEBOOK WELDING TYPES AND TROUBLESHOOTING DIGITAL MICROSCOPE IMAGING EXAMPLES CWhat Is Welding Generally speaking welding refers to the method of melting metals to join them together There are multiple di ?erent methods of welding In fusion welding the metals to be joined together are melted In pressure welding the metals are joined through the application of pressure In brasing the base metal is not melted and instead a metal ?ller metal having a melting point lower than the base metal is melted to join the metals together Compared to mechanical joints using rivets and bolts welding is an economic method that saves materials and time Welding Terminology Heat-a ?ected zone Base metal Weld metal Extra ?ll Groove Penetration Extra ?ll View from the top Bead Base metal Term Weld metal Explanation The metal part that is melted and solidi ?es during welding Toe of the weld Heat-a ?ected zone The part whose metallic structure and characteristics are changed due to the e ?ect of the welding heat even though it is not melted Welded part The area speci ?ed by the weld metal and the heat-a ?ected zone Extra ?ll Penetration Bead The part in which the weld metal is ?lled in excess of the necessary dimensions The maximum distance from the edge of the heat-a ?ected zone to the surface of the base metal before melting Generally the welded parts of the weld line weld metal are called beads Toe of the weld The boundary between the weld beads and the base metal surface Groove The groove established between the base metals to be welded CWhat Is Welding Welding Types and Troubleshooting Observing Welding with a Digital Microscope Common Types of Welding Joining method Name Arc welding Fusion Gas welding Laser welding Pressure Spot welding Seam welding Brasing Hard brasing Soft brasing Characteristics By passing an electric current through plasma arc within a shielding gas heat is generated and can be used to melt metal This is the most common method of welding and it has the advantage of providing fast welds Metal is melted by way of gas combustion Most commonly acetylene gas is used The welding speed is slower than arc welding but it is easy to check the welding locations which makes this method suited for the welding of thin plates Typical laser examples are CO lasers and YAG lasers This is a new welding method but it has been applied to the welding of vehicle bodies in recent years This type of welding uses electric resistance to generate heat Pressure is applied to metal plates and an electric current is run through them in order to weld them together A typical example is the spot welding of vehicle bodies This type of welding also uses electric resistance to generate heat Because the welding can be done continuously this method is used in applications that require a hermetic seal such as containers for storing liquids or gases In brasing a ?ller metal is used to