[MW:15917] welding done on forge materials fitting body surface.

Dear expert,

We are using carbon steel forgings (unequal tee A105N) materials for piping applications, but as per site condition pipe support coming at the position of unequal tee.

as per ASTM A105/A105M clause no :-13
13. Repair by Welding

13.1 Repair of defects by the manufacturer is permissible
for forgings made to dimensional standards such as those of
ANSI or for other parts made for stock by the manufacturer.
Prior approval of the purchaser is required to repair-weld
special forgings made to the purchaser's requirements.

13.2 The welding procedure and welders shall be qualified
in accordance with Section IX of the ASME Boiler and
Pressure Vessel Code.
13.3 Weld repairs shall be made by a process that does not
produce undesirably high levels of hydrogen in the welded
areas.
13.4 Defects shall be completely removed by chipping or
grinding to sound metal as verified by magnetic particle
inspection prior to welding.
13.5 After repair welding, the area welded shall be ground
smooth to the original contour and shall be completely free of
defects as verified by magnetic-particle or liquid-penetrant
inspection.
13.6 All forgings repaired by welding shall be post-weld
heat treated between 1100°F [593°C] and the lower
transformation temperature for a minimum of 1⁄2 h/in. [1⁄2
h/25.4 mm] of maximum section thickness, or alternatively
annealed, normalized and tempered, or quenched and
tempered. If the forging was not previously heat treated, the
original tempering temperature was exceeded, or the forging
was fully heat treated in the post weld cycle, then the forging
shall be tested in accordance with Section 9 on completion of
the cycle.
13.7 The mechanical properties of the procedure qualification
weldment shall, when tested in accordance with
Section IX of the ASME Boiler and Pressure Vessel Code,
conform with the requirements listed in Table 3 for the thermal
condition of repair-welded forgings.
13.8 Repair by welding shall not exceed 10 % of the surface
area of the forging nor 331⁄3 % of the wall thickness of the
finished forging or 3⁄8 in. [10 mm], whichever is less, without prior approval of the purchaser.

My question is
1. we can allow to weld pipe support on the unequal tee body surface(forgings material A105N)
2. PWHT is required or not, if yes why?
3. why we don't done PWHT at the time of joint welding forgings materials to pipe(edge to edge).
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Thanks & Regards
Pinaki Boxi.
Mob-+919178466059

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