1. SSAW pipes have high residual stress, while LASW pipes, due to uniform diameter expansion, have very limited residual stress.
2. Because SSAW pipes are formed and welded simultaneously, inspection is impossible. LASW pipes, however, are formed first and then welded, allowing for comprehensive inspection during the process to ensure quality.
3. SSAW pipes have spiral welds, while LASW pipes have straight welds. LSAW pipes have significantly fewer welds than SSAW pipes.
4. SSAW pipes exhibit severe stress concentration in the welds, resulting in a large heat-affected zone, making them most susceptible to cracking and other failure effects.
5. LSAW pipes have high dimensional accuracy, while SSAW pipes have slightly lower dimensional accuracy. Higher accuracy leads to easier installation.
6. LSAW pipes can undergo non-destructive testing, but to determine the quality of SSAW pipes, destructive testing methods are required.
