ASTM A672 LSAW Steel Pipe

 

A672 straight seam pipe is an American standard steel pipe made by electric fusion welding for moderate temperature and high-pressure applications. It is commonly used for transporting high-pressure gases, liquids, steam, and other fluids, as well as for conveying gas, natural gas, oil products, and chemicals.

A672 LSAW Welded Pipe Specification

	ASTM A672
	Grade A45,A55,B60,B65,etc.
	406-1422.40mm
	1.65-40mm
	6mtr-20mtr
	3PE Coating;3PP Coating;FBE Coating;Epoxy Coating;Special Painting
	3 Tons

A672 Welded Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Non-Destructive Testing of A672 Straight Seam Steel Pipe

1. Basic Requirements for the Appearance of Straight Seam Steel Pipe Welds
Before performing non-destructive testing on straight seam steel pipes, the weld appearance inspection should meet the following requirements. The appearance and surface quality of the straight weld seams used for pipe joints should generally comply with the following:
- The welding shape should be good, with a width of 2mm covering both sides of the groove. The height of the fillet weld should comply with design specifications, and the shape should transition smoothly.
- Weld Surface:
(1) Cracks, lack of fusion, slag inclusion, and spatter are not allowed.
(2) For steel pipes with a design temperature below -29 degrees Celsius and stainless steel pipes with a high hardening tendency, the weld surface must not have undercut. For other related materials, the undercut depth should be greater than 0.5mm, with the continuous length of the undercut not exceeding 100mm, and the total length of the undercut on both sides of the weld should not exceed 10% of the total weld length.
(3) The weld surface should not be lower than the pipe surface, with the height of the weld reinforcement not exceeding 3mm.
(4) The misalignment of welded joints should not exceed 10% of the wall thickness and should not exceed 2mm.

2. Surface Non-Destructive Testing
The choice of surface non-destructive testing methods for straight seam steel pipes follows these principles: magnetic particle testing is used for ferromagnetic steel pipes, and penetrant testing is used for non-ferromagnetic steel pipes.
For weld joints prone to hot cracks, an important surface non-destructive test should be conducted both after welding and after heat treatment. For weld joints prone to delayed cracking, surface non-destructive testing should be conducted after a certain cooling period.
Surface non-destructive testing should be carried out according to standard requirements. The objects and applications of surface non-destructive testing are generally as follows:
(1) Quality inspection of the pipe's outer surface.
(2) Inspection of surface defects in important butt welds.
(3) Surface defect inspection of important fillet welds.
(4) Surface defect inspection of important socket weld and branch weld joints in crossover tees.
(5) Groove inspection of weld joints with a high hardening tendency.
(6) Archwilio rhigolau mewn pibellau dur di-staen nad ydynt yn austenitig gyda thymheredd dylunio sy'n is na neu'n hafal i -29 gradd Celsius.
(7) Archwilio welds dwy ochr ar ôl glanhau.

3. Pelydr-X a Phrofi Ultrasonic
Prif wrthrychau profion pelydr-X a ultrasonic yw cymalau casgen pibellau dur wedi'u weldio â sêm syth a chymalau casgen ffitiadau pibellau wedi'u weldio.
Dylai gwythiennau weldio sy'n dueddol o oedi cracio ar ôl weldio gael profion pelydr-X a ultrasonic ar ôl cyfnod oeri penodol. Pan fo weldiadau cylchedd ar y brif bibell y tu mewn i'r casin, dylai'r wythïen weldio gael prawf pelydr-X 100%, a dim ond ar ôl i bwysau'r prawf gymhwyso y gellir cyflawni gweithrediadau cudd.
Dylai cymalau Weld sydd wedi'u gorchuddio â modrwyau atgyfnerthu neu badiau cymorth ar y biblinell gael archwiliad radiograffig 100%, a dim ond ar ôl pasio y gellir eu gorchuddio eto. Mae arolygiadau NDT canolraddol a drefnwyd o wythiennau weldio yn cynnwys archwiliad gweledol, archwiliad radiograffig, a phrofion ultrasonic o'r NDT arwyneb. Rhaid gwerthuso gwythiennau Weld a'u pasio cyn weldio pellach.

 

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