What composition of brazing filler metal is traditionally selected for joining structural steel plates_________________?
Show answer Hide answer
Answer: A. Melts below the melting points of base metals
Explanation
Brazing joins metals by heating them and applying a filler metal that melts at a temperature below the base materials. Structural steel plates require filler metals with liquidus temperatures exceeding four hundred fifty degrees Celsius. Keeping filler melting points below base metal melting temperatures prevents harmful structural distortion or melting. Brazing differs from welding because base metals are not melted during the joining process execution. Capillary action draws molten brazing filler metal into the tight joint clearance between fitted steel plates. Filler metal selection depends on joint strength requirements, corrosion resistance, and base metal composition.
Automotive tubing and structural assemblies frequently utilize brazing to create leak-tight, high-strength joints. HVAC manufacturing employs copper-zinc brazing alloys to join steel and copper components securely. Proper joint design ensures adequate capillary attraction for uniform filler metal distribution during heating. Melting below three hundred degrees Celsius describes soldering rather than structural steel brazing filler metals. Copper-phosphorus alloys are typically used for brazing copper and its alloys rather than joining structural steels. Pure copper wire can be used in specialized furnace brazing but filler metals generally encompass various alloy compositions.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Steel brittleness caused by high sulfur content can be mitigated by introducing ______________?
Show answer Hide answer
Answer: A. Manganese
Manganese readily reacts with dissolved sulfur to form stable manganese sulfide inclusions. This chemical reaction prevents the formation of low-melting iron sulfide films at grain boundaries. Eliminating iron sulfide ne...
Q2. The break-even point marks the operating level where a business incurs neither profit nor loss. In such cost analysis, the total expenses consist of fixed costs plus what other category________________?
Show answer Hide answer
Answer: B. Plus variable cost
Total operating expenses in cost-volume-profit analysis equal the sum of fixed costs and variable costs. Fixed costs remain constant regardless of production volume, while variable costs change with output. The break-eve...
Q3. An air compressor operating at high altitudes compared to sea-level will exhibit _______________ capacity and power requirements?
Show answer Hide answer
Answer: B. Less
Lower atmospheric pressure at high altitudes reduces the density of incoming intake air. Reduced air density decreases the mass flow rate delivered by the compressor per revolution. Lower mass flow directly translates to...
Q4. How is the joining process known as brazing defined regarding the melting temperatures of the parent metals _____________________?
Show answer Hide answer
Answer: C. Both A. & B.
Brazing requires the parent base metals to remain completely solid while the filler metal melts. The filler metal used in brazing operations is always a non-ferrous alloy melting above 450°C. Both conditions are mandator...
Q5. Carbide-tipped industrial cutting inserts are fabricated via powder metallurgy and typically possess what chemical composition_____________________?
Show answer Hide answer
Answer: A. 90% tungsten carbide and 10% cobalt
Cemented carbide cutting tools combine hard tungsten carbide particles with a ductile cobalt binder phase. The standard industrial composition utilizes approximately ninety percent tungsten carbide and ten percent cobalt...
Q6. Case hardening cannot be achieved via________________?
Show answer Hide answer
Answer: D. Both ‘B’ & ‘C’
Hot dipping and electroplating apply external coatings rather than diffusing elements into the steel matrix. Case hardening requires thermo-chemical diffusion to alter the chemical composition of the steel surface. Surfa...