1. hàn khuyết tật
1.1. disability out
1.1.1. crack
1.1.1.1. cause
1.1.1.1.1. high arc
1.1.1.1.2. wrong electrode
1.1.1.2. Remedies
1.1.1.2.1. reduce the arc length or lower the arc voltage
1.1.1.2.2. keep the electrode angle from 30 to 45 degree
1.1.2. undercut
1.1.2.1. cause
1.1.2.1.1. the longer the arc
1.1.2.1.2. improper gas shielded
1.1.2.2. remedies
1.1.2.2.1. using the right polarity
1.1.3. Spatte
1.1.3.1. reducing the arc length and welding current
1.1.3.2. incorrect polarity
1.1.3.3. the longer the arc
1.1.4. Porosity
1.1.5. Overlap
1.1.6. Crater
1.2. disability in
1.2.1. Slag Inclusion
1.2.2. Incomplete Fusion
1.2.3. Necklace cracking
1.2.4. Incompletely filled groove or Incomplete penetration
2. Welding regime
2.1. Selection of Electrode
2.1.1. speed
2.1.1.1. Speed normal => đều phẳng đẹp
2.1.1.2. Speed too fast => thin, weak bead
2.1.1.3. Speed too Slow => wide tall build up of weld