The table below shows four welding defects - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Question 4
The table below shows four welding defects. Redraw the table in your ANSWER BOOK and write down the answers to QUESTIONS 4.1.1 to 4.1.8.
| ILLUSTRATION | NAME OF TH... show full transcript
Worked Solution & Example Answer:The table below shows four welding defects - NSC Agricultural Technology - Question 4 - 2021 - Paper 1
Step 1
4.1.1 Name of the welding defect
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Porosity - Caused by trapped gas within the weld.
Spatter - Often results from the welding voltage being too low.
Undercut - Can occur due to improper welding speed.
Lack of fusion - Might be caused by insufficient heat input.
Step 2
4.1.2 Give the possible causes
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Porosity: Blocked nozzle, gas flow too low, moisture in the weld area.
Spatter: Voltage too low, improper welding speed.
Undercut: Wrong heat settings, too fast travel speed.
Lack of fusion: Low amperage for welding, incorrect angle.
Step 3
4.1.3
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
3.1. - Undercut or lack of support.
4.1. - Porosity or spatter.
Step 4
4.1.4
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
5.1. - Spatter involves excessive molten metal expelled from the weld.
6.1. - Undercut relates to a groove on the edge of the weld.
Step 5
4.1.5
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Welding speed too low can lead to increased heat and distortion.
Step 6
4.1.6
97%
121 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
A lack of fusion occurs when the weld pool does not adequately bond to the base material.
Step 7
4.1.7
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Spatter is typically caused by excess heat and improper travel.
Step 8
4.1.8
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Porosity can lead to weakening of the weld and structural integrity.
