1. seam welding
2. projection welding
3. thermit welding
4. percussion welding
projection welding
1. seam welding
2. projection welding
3. thermit welding
4. percussion welding
seam welding
1. higher conductivity
2. lower conductivity
3. same conductivity
4. none of the above
higher conductivity
1. spot welding
2. projection welding
3. seam welding
4. none of these
seam welding
1. 0.025 to 3 mm
2. 3 to 6 mm
3. 6 to 10 mm
4. more than 10 mm
0.025 to 3 mm
1. half
2. equal
3. 1.5 times
4. double
equal
1. spot welding
2. projection welding
3. seam welding
4. are welding
seam welding
1. spot welding
2. projection welding
3. seam welding
4. are welding
seam welding
1. 10000C to20000C
2. 2000 0C to 40000 C
3. 40000 C to 60000 C
4. 6000 0C to 70000 C
40000 C to 60000 C
1. A.C. current of high frequency
2. A.C current of low frequency
3. D.C. current
4. all of these
all of these