Kev faib tawm ntawm cov kav dej sib npaug: cov kav hlau tau muab faib ua cov kav hlau tsis sib haum thiab cov kav hlau welded (cov kav dej sib txuas), cov kav dej kub dov seamless square kav, txias-draw seamless square kav, extruded seamless square kav, thiab welded square kav.
Lub welded square raj tau muab faib ua:
1. Raws li cov txheej txheem - arc welded square raj, kuj welded square raj (siab zaus, tsawg zaus), roj welded square raj, rauv welded square raj;
2. Raws li cov vuam seam - ncaj seam welded square raj, kauv welded square raj.
