erw1 Before pipe welding, pipe is formed in round shape passing through a series of driven and idler rollers of forming section. In welding section pipe is longitudinally welded by using high frequency induction welding method. Outside bead is removed and formed in shape of scrap. The weld seam is ironed and pipe passes through the cooling section.Nota:(1)I valori nella tabella sono adatti per il campione standard a grandezza naturale.

Standard	Grado	Minimo trasversale impatto del corpo del tubo					Minimo trasversale impatto della saldatura (J)
		(J)
		D≤508	508mm	762mm	914mm	1219mm	1422mm	1422mm
API 5L SPEC	≤L415×60	27(20)	27(20)	40(30)	40(30)	40(30)	27(20)	40(30)
	>L415×60	27(20)	27(20)	40(30)	40(30)	54(40)	27(20)	40(30)
	≤L450×65
	>L450×65	27(20)	27(20)	40(30)	40(30)	54(40)	27(20)	40(30)
	≤L485×70
	>L485×70	40(30)	40(30)	40(30)	40(30)	54(40)	27(20)	40(30)
	≤L555×80