Siart Trwch Pibellau ERW

Proses Gweithgynhyrchu:

Mae pibellau ERW yn cael eu cynhyrchu trwy ffurfio stribed gwastad o ddur yn siâp silindrog. Yna caiff ymylon y stribed dur eu gwresogi i dymheredd weldio gan ddefnyddio cerrynt trydan amledd uchel, a gosodir pwysau i greu weldiad. Mae'r broses yn arwain at wythïen ar hyd y bibell.
Mathau o wythïen:

Gall pibellau ERW fod â dau fath o wythiennau:
Sêm Hydredol (LS): Mae'r wythïen yn rhedeg ar hyd y bibell.
Sêm Troellog (SS): Mae'r sêm yn troellog o amgylch y bibell, a ddefnyddir yn nodweddiadol mewn pibellau diamedr mwy.

Siart trwch pibell a thiwb ERW:

DN	Diamedr Allan		Siart Trwch
DN	Mae cyfres	cyfres B	Atod 5s	Atod 10s	Atod 20s	LG	Atod 20	Atod 30	STD	Atod 40	Atod 60	XS	Atod 80	Atod 100	Atod 120	Atod 140	Atod 180
32 40 50	42.4 48.3 60.3	38 45 57	1.6 1.6 1.6	2.8 2.8 2.8	3.2 3.2 3.6	- - -	- - 3.2	- - -	- - -	3.6 3.6 4.0	- - -	- - -	5.0 5.0 5.6	- - -	- - -	- - -	6.3 7.1 8.8
65 80 90	76.1 88.9 101.6	76 89 -	2.0 2.0 2.0	3.0 3.0 3.0	3.6 4.0 4.0	- - -	4.5 4.5 4.5	- - -	- - -	5.0 5.6 5.6	- - -	- - -	7.1 8.0 8.0	- - -	- - -	- - -	10.0 11.0 12.5
100 125 150	114.3 139.7 168.3	108 133 159	2.0 2.9 2.9	3.0 3.4 3.4	4.0 5.0 5.0	- - -	5.0 5.0 5.6	- - -	- - -	5.9 6.3 7.1	- - -	- - -	8.8 10.0 11.0	- - -	11.0 12.5 14.2	- - -	14.2 16.0 17.5
200 250 300	219.1 273.0 323.9	219 273 325	2.9 3.6 4.0	4.0 4.0 4.5	6.3 6.3 6.3	- - -	6.3 6.3 6.3	7.1 8.0 8.8	- - -	8.0 8.8 10.0	10.0 12.5 14.2	- - -	12.5 16.0 17.5	16.0 17.5 22.2	17.5 22.2 25.0	20.0 25.0 28.0	22.2 28.0 32.0
350 400 450 500 550 600	355.6 406.4 457.0 508.0 559 610	377 426 478 529 - 630	4.0 4.0 4.0 5.0 5.0 5.6	5.0 5.0 5.0 5.6 5.6 6.3	- - -	8.0 8.0 8.0 8.0 8.0 8.0	8.0 8.0 8.0 10.0 - -	10.0 10.0 11.0 12.5 - -	10.0 10.0 10.0 10.0 10.0 10.0	11.0 12.5 14.2 16.0 - 17.5	16.0 17.5 20.0 20.0 - -	13.0 13.0 13.0 13.0 13.0 13.0	20.0 22.2 25.0 28.0 30.0 32.0	25.8 28.5 30.0 32.0 - -	28.0 30.0 36.0 40.0 - -	32.0 36.0 40.0 45.0 - -	36.0 40.0 45.0 50.0 - -

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