Question

1. in smaw welding, which welding position is represented by a 4?

a) flat position
b) horizontal position
c) vertical position
d) overhead position

1. in smaw welding, what is the primary cause of \burn - through\?

a) insufficient amperage
b) incorrect electrode angle
c) excessive heat input
d) lack of flux

1. which of the following is not a typical application of smaw welding?

a) automotive body repair
b) shipbuilding
c) jewelry making
d) construction

1. in smaw welding, what is the purpose of \backing bars\?

a) to support the work piece during welding
b) to provide electrical insulation
c) to protect the welding machine from overheating
d) to shape the weld bead

1. in smaw welding, what is \tack welding\?

a) a welding process using a torch
b) a type of welding electrode
c) temporary welds used to hold parts in position before final welding
d) a type of welding position

1. which of the following is a common application of smaw welding in the construction industry?

a) welding jewelry
b) welding pipes for water supply
c) welding surgical instruments
d) welding structural steel components

Explanation:

• Question 41: In SMAW welding, the numbering system for welding positions: 1 - flat, 2 - horizontal, 3 - vertical, 4 - overhead.
• Question 42: Burn - through occurs when too much heat melts the base metal completely. Excessive heat input (e.g., too high amperage, too slow travel speed) is the main cause. Insufficient amperage would lead to poor fusion, incorrect electrode angle to defects like lack of fusion or slag inclusions, and lack of flux (in SMAW, electrodes have flux coatings) would lead to porosity or other shielding - related issues.
• Question 43: SMAW (Shielded Metal Arc Welding) is used for heavy - duty applications. Automotive body repair (some parts), shipbuilding (steel structures), and construction (steel fabrication) are common. Jewelry making usually requires more precise and often lighter - heat processes like gas welding or micro - welding, not SMAW.
• Question 44: Backing bars are placed on the root side of a weld joint. Their purpose is to support the molten weld metal and help shape the weld bead (especially the root pass). They are not for electrical insulation (insulating materials are used for that), not for protecting the machine (cooling systems and circuit breakers do that), and while they support the work - piece during welding to some extent in terms of weld bead formation, their main role is weld bead shaping.
• Question 45: Tack welding is done to hold parts in position (e.g., aligning two metal plates before full welding). It is not a process using a torch (that might be gas welding), not a type of electrode (electrodes are consumables), and not a welding position (positions are about the orientation of the weld joint).
• Question 46: In construction, welding structural steel components (beams, columns) is a major application. Welding jewelry (as above, not SMAW), welding pipes for water supply might use other processes like TIG or MIG in some cases (but structural steel is more typical for SMAW in construction), and welding surgical instruments requires very high precision and often different (cleaner) processes than SMAW.

Answer:

1. d) Overhead position
2. c) Excessive heat input
3. c) Jewelry making
4. d) To shape the weld bead
5. c) Temporary welds used to hold parts in position before final welding
6. d) Welding structural steel components