Seamless or Welded Fittings

Please go through the standard A234 according to which welded fittings are made. Unless and other wise spcified in the order, manufacturer can supply welded fitting as per order. Part of the standard is pasted here for your ref. from description it is clear that welded jints can be more then one.

SA-234/SA-234M 1998 SECTION II

2.5 ASNT Standard:

SNT-TC-1A(1984) Recommended Practice for Nondestructive

Testing Personnel Qualification and Certification

3. Ordering Information

3.1 Orders for material under this specification shall

include the following information:

3.1.1 Quantity (number of fittings of each kind),

3.1.2 Description of fitting and nominal dimensions

(standard or special),

3.1.3 Steel composition by grade and class designation,

3.1.4 Construction, seamless or welded (unless

seamless or welded construction is specified by the

purchaser either may be furnished at the option of the

supplier),

3.1.5 Additional requirements, if any, (See

17.5), and

3.1.6 Supplementary requirements, if any.

4. Materials

4.1 The material for fittings shall consist of killed

steel, forgings, bars, plates, seamless or fusion-welded

tubular products with filler metal added and shall conform

to the chemical requirements of Table 1. Unless

otherwise specified for carbon steel plates, the steel

may be made to either coarse grain or fine grain

practice.

4.2 A starting material specification that specifically

requires the addition of any element beyond those listed

for the materials in Tables 1 and 2 and for the applicable

grade of material is not permitted. This does not

preclude the use of deoxidizers or the judicious use

of elements for grain size control.

5. Manufacture

5.1 Forging or shaping operations may be performed

by hammering, pressing, piercing, extruding, upsetting,

rolling, bending, fusion welding, machining, or by a

combination of two or more of these operations. The

forming procedure shall be so applied that it will not

produce injurious imperfections in the fittings.

354

5.2 Fittings machined from bar shall be restricted

to NPS 4 or smaller. Elbows, return bends, tees, and

header tees shall not be machined directly from bar

stock.

NOTE 1 - Fittings NSP-4 and under may be machined from hotforged

or rolled, cold-sized, and straightened bar stock having the

chemical composition of the grade in Table 1 and the mechanical

properties of the Grade in Table 2. Heat treatment shall be in

accordance with Section 6. All caps machined from bar stock shall

be examined with by liquid penetrant or magnetic particle in accordance

with S3 or S4.

5.3 All welds including welds in tubular products

from which fittings are made shall be (1) made by

welders, welding operators, and welding procedures

qualified under the provisions of ASME Section IX,

(2) heat treated in accordance with Section 6 of this

specification, and (3) radiographically examined

throughout the entire length of each weld in accordance

with Article 2, ASME Section V with acceptance limits

in accordance with Paragraph UW-51 of ASME Section

VIII, Division 1 of the ASME Boiler Pressure Vessel

Code. In place of radiographic examination, welds may

be ultrasonically examined in accordance with Appendix

12 of Section VIII. The NDE of welds in Grades WPB,

WPC, WP1, WP11 Class 1, WP11 Class 2, WP11

Class 3, WP12 Class 1, WP12 Class 2, and WPR may

be performed either prior to or after forming. NDE of

welds in Grades WP5, WP9, WP91, WP22 Class 1,

and WP22 Class 3 shall be done after forming.

5.4 Personnel performing NDE examinations shall

be qualified in accordance with SNT-TC-1A.

5.5 The welded joints of the fittings shall be finished

in accordance with the requirements of Paragraph UW-

35 (a) of ASME Section VIII, Division 1.

I hope this will clear your doubt.