Metal: joining metal

Question 1

4 ways of joining metal

Answer 1

1. Soldering
2. Brazing
3. Welding
4. Riveting and pop riveting

Question 2

Process of soldering

Answer 2

• melting the solder (usually lead and tin)
• soldering iron with the pointed tip & damp the sponge to clean the tip
• place the tip on the part that you want to heat
• wait for few secs to warm the part and connect with the solder

Question 3

Adv. of soldering

Answer 3

• can be operate at low temp.
• base metal doesn’t melt
• any metal//non-metal can be joined
• easy

Question 4

Dis. of soldering

Answer 4

• less strength
• not useful when joint works under high temp
• heavy metals can’t be weld

Question 5

Different types of brazing

Answer 5

• torch brazing
• dip brazing
• induction brazing
• furnace brazing

Question 6

Process of brazing

Answer 6

• get the filler material that is melted by using “OXYACETYLENE” flame
• clean the surface material
• heat the joint where 2 pieces will join
• apply the brazing rod
• after the process, use a wire brush to clean the surface to remove “OXIDATION” or “RESIDUE”

Question 7

Adv. of brazing

Answer 7

• base metal doesn’t melt
• can join similar metals

Question 8

Dis. Of brazing

Answer 8

• can’t join large sections
• not strong as welding
• high temp can cause damages
• possible toxic elements in the filler material

Question 9

Welding process

Answer 9

• create a molten pool which can add the filler rod
• use “OXYACETYLENE” torch and a filler rod
• add “ACETYLENE” to start the torch and adjust the size of the flame
• start heating the steel
• add a filler rod (similar to soldering)

Question 10

Adv. of welding

Answer 10

• permanent
• various shape can be joined
• leak-proof
• 100% strength

Question 11

Dis. Of welding

Answer 11

• distortion
• poor performance under vibration
• inspection is difficult

Question 12

Hot riveting process

Answer 12

• heat your rivet until it turns orange
• insert your hot rivet to your metal hole by putting the rivet end on top
• use a machine to press down the hot rivet and it should turn out as a half circular shape

Question 13

Pop riveting process (when we did the candle holder)

Answer 13

• change/swap the head of the rivet gun
• put the stem/mandrel into opening head
• grab the handle in place
• insert the rivet into your metal pieces
• press down the handle couple times until the rivet pops out

Question 14

Adv. of riveting and pop riveting

Answer 14

• flexibility in design
• durability
• easy inspection&maintenance

Question 15

Dis. Of riveting and pop riveting

Answer 15

• more work force
• higher structural weight
• take more time