SI · 8 cards

Joining Materials flashcards

8 cards with the formulas, rules and traps from this lesson. Answer in your head, then flip to check.

Term · 1/8
Fusion welding: what melts?
The base metal itself melts locally at the joint and solidifies into one continuous piece; filler may or may not be added. Heat comes from an electric arc or a gas flame.
Rule · 2/8
Brazing vs soldering: what is the dividing line?
Both melt only a filler while the base metal stays solid. Brazing filler liquidus is above 840 °F (450 °C) but below the base metal's melting point; soldering filler melts at or below 840 °F (450 °C).
Term · 3/8
What clues identify stick welding (SMAW)?
A consumable coated electrode (rod) supplies filler; its flux coating makes shielding gases and slag that must be chipped off. Clue words: coated rod, electrode holder, slag.
Fact · 4/8
MIG (GMAW) vs TIG (GTAW): how do the electrodes differ?
MIG continuously feeds a consumable wire that is both electrode and filler, with shielding gas. TIG uses a nonconsumable tungsten electrode plus shielding gas; filler rod is added separately if needed.
Term · 5/8
What is resistance spot welding and where is it common?
Electrodes squeeze overlapping conductive sheets and pass current; electrical resistance heats the contact spot and pressure forms a weld at discrete spots. Common in high-volume sheet-metal production.
Fact · 6/8
Which joints are removable, and which are permanent?
Bolted or screwed joints can be taken apart without destroying the parts. Welds, cured structural adhesives and set rivets are permanent and must be cut, ground or drilled out to separate.
Common trap · 7/8
Trap: does a bigger bead, bright solder or smooth weld prove a strong joint?
No. Excess filler or adhesive can hide poor wetting, porosity or incomplete fusion. Appearance is not proof of strength, and a hotter process is not automatically stronger.
Formula · 8/8
Torque on a wrench: formula and example
$τ = F \times r$ : perpendicular force F (N) times moment arm r (m), giving N·m. Example: 20 N on a 0.25 m handle gives 5 N·m. Torque is not the same as bolt preload.

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