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24 Cards in this Set
- Front
- Back
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basic methods for joining metal together
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Mechanical, Chemical, & Welding
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what 3 categories can welding be broken into
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Pressure welding, Fusion welding, & Braze welding
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Pressure welding
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The metal is heated to a softened state by electrodes.
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Fusion welding
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pieces of metal are heated to the melting point, joined together usually with a filler rod, and allowed to cool
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Braze welding
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metal with a melting point lower than the base metal to be joined is melted over the joint of the pieces being wildest without fusing pieces of base metal. it can be classified as either soft or hard.
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Soft brazing
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done with brazing material that melts at a temperatures below 850°F
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Hard brazing
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is done with brazing materials that melt at a temperatures above 850°F
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Weld root
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is the part of the joint where the wire electrode is directed
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Weld face
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is the exposed surface of the weld on the side that has been welded.
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Weld penetration
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is the height of the exposed surface of the weld on the back side
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Burn mark
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on the back of weld is an indication of a good weld penetration
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What causes a burn through
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it results from penetration too much into the lower base metal. which burns a hole through the back side of the metal.
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Fillet weld parts include
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Weld legs, Weld throat
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Weld legs
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Are the width and height of the weld bead
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Weld throat
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refers to the depth of the triangular cross section of the weld.
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Joint fit-up
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refers to holding work pieces tightly together, in alignment, to prepare for welding.
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3 welding operations
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MIG, TIG, & Soft brazing
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MIG welder
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a wire feed arc it's used for steel uni body panels, heavy-gauge fullframes. because majority of new vehicles use his construction. it is the most common used method in body shops.
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Tungsten inert gas (TIG)
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uses a handheld rod & gas - shielded arc, is often used when welding ALUMINUM ALLOY body panels.
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Why is TIG welding aluminum better than MIG welding
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because large diameter, soft aluminum wire does not feed through a MIG welder as well as steel wire. the soft wire tend to jam the MIG welder. it easier to control an prevent burn-through.
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Soft brazing / Oxyacetylene gas
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recommended on late model vehicles to join seal the corners food panels N other large parts.
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Typical MIG wire sizes on uni body
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today's uni body panels are b welded using 0.023-inch (0.58 mm) MIG wire.
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Typical MIG wire size on a frames
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0.03-inch (0.76 mm)
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Typical MIG wire size on body - over - frame steel members
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0.035-inch (0.89 mm)
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