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CAS TUNGSTEN ARC - SHIELDED.

METAL ARC WELDING OF STAINLESS STEEL

IN BORATED WATER PIPING SYSTEMS

1. Scope

This welding procedure shall be utilized when making welds and

weld repairs on the 304 SS and 304L SS piping in the - following systems:

A. Spent Fuel

B. Decay Heat

C. Building Spray

D. Make-Up

E. Core Flood

Included in this procedure are the requirements specifically related

to producing a corrosion resistant I.D. weld overlay (I.D. Buttering)

,on the ends of existing 304 SS pipes as recommended in NUREG-0313. Also,

das recommended in this document, wherever possible, replacement stainless

steel piping material will contain .035% Carbon max.

2. Welding Procedure Specification (WPS)

The basic WPS defining the essential variables to be utilized for

this repair are contained in Catalytic WPS No. SP-4200-SS(N)-102A. Non-

essential variables specifically tailored for this repair are defined

herein. The basic weld procedure specification shall have been qualified

in accordance with the requirements of ASME:Section IX and Regulatory

Guide 1.31.::

3. I.D. Weld Clad (Buttering)

When butt weld joints are to be made between replacement 304L SS,

piping and - the original 304 SS piping in the system, the 304 - SS pipe

ends shall be prepared in the following manner:--

80040702_9 5 ,

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__ _ _ _ _ _ _ _ _ _ _ _ - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

. ... .

., . . . -

K. . -

3. -I.D. Weld Clad (Buttering) (Continued)-

. . A.- If the pipe end has been thermally _ cut, a minimum of 1/8" of_

metal must be removed from the cut and to eliminate the heat-affected-

zone (RAZ) from the cutting operation.

B. . Clean the pipe end per WPS 4200-SS(N)-102A.

C. - Weld clad the I.D. surface of the pipe end to a width of .5" Rev. 2

min, with a single layer ofL SFA-5.9 Class ER 308L filler metal with

5 FN minimum ferrite, using the GTAW process.. (See sketch I).

D. . Maximum joulian heat input as established during the I.D. weld.

clad qualification (GPU Lab No's. 56052 rev.1 & 58632) shall be 35,000 |Rev. 1

joules / inch utilizing the following electrical characteristics:

Arc Voltage 8 - 12 volts-

Current 80 - 95 amps-

2 - 4 in./ min. Rev. 1Travel Speed -

~

E. Maximum interpass temperature shall be 100*F.

F. Af ter the I.D. weld cladding is complete the pipe- end shall be

ground back21/8" to assure the weld clad becomes integral with the weld

root. The butt weld joint geometry shall then be prepared by machining

or grinding. Joint geometry shall be a 37-1/2* + 2-1/2' single bevel with

a 3/32" + 1/32" land. (See sketch I).

NOTE: Grinding shall not be performed on the weld clad or pipe1

internal surfaces except in the immediate vicinity of |l

the weld root to facilitate joint fit up and then only I

I light grinding is permitted to remove high spots..

Maximum I.D. mismatch on fit up shall be 1/16". I

4 ., Butt Weld Procedure

-A. Butt welding shall be in accordance with Catalytic WPS 4200-SS(N)-

' hh :102A.

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.M, ,7<, ? - 4. Butt Weld Procedure (Continued)A-

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f?f''S,' I B. The root and first pass shall be deposited by the GTAW process

J %| .|~,'.:<^tv / utilizing SFA-5.9. Class ER 308L filler metal with a minimum of 5 FN ferrite.-

0.9a [ ''[ .

1.'c8 .'.- Argon gas backing shall be utilized during the first two passes.

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C. The weld shall be completed utilizing the SMAW process with |

" c. *L. .

f'' ' 4C SFA-5.4 Class E308L-16 electrodes with a minimum of 5 FN ferrite.,

,o: ,-

'F .T D. Maximum heat input during the welding shall be 35,000 joules /in.: a:,: d :p~.v |

f''}' with a 300*F max. interpass temperature.?SF?

$ ,; . E. Electrical characteristics shall be as follows:. +; ,,f-

' #'~4 GTAW SMAW-

"I Voltage 10 - 12 volts 20 - 23 voltsc-

-E_- Current 75 - 100 amps 80 - 100 amps Rev. 1

Travel Speed 2 - 4 in./ min. 4 - 6 in./ min.>

5. Quality Control

(h A. The quality control inspectcr shall verify the following:

, 1)- Correct materials, including filler metals, are being

utilized.- -

-

2) I.D. weld clad and joint geometry dimensions are correct.

3) Joint fit up has correct dimensions and alignment.

B. Quality Control shall also perform spot checks to assure proper

electrical characteristics and interpass temperatures are being utilized

during welding.

C. Quality Control shall perform final visual inspection per the

1

5 applicable quality control procedures.

.

,

Rev. 0 - 9/25/79)

^' Rev. 1 - 11/29/79

Rev. 2 - 12/4/79

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