Asme sec. ix bkr - 051010

This document is a property of L&T and must not be copied or lent with1
Introduction to
ASME Sec. IX
5-Oct. 2006
Manufacturing Technology- I
S.C.Ghosh

ASME Sec. IX
General guide lines for procedure and performance
qualification
Referenced by all ASME code of construction
 Covers welding as well as Brazing operations

Welding procedure specification (WPS)
Procedure Qualification Records (PQR)
WPS:
It is a written procedure prepared to provide welding parameters for
making welds as per code requirement.
Can be used on production only after successful qualification of
supporting PQR(s).
A WPS can be supported by one or multiple PQR(s).
PQR:
Record of the actual welding data used to weld a test coupon.
Also contains test results (Mechanical, Chemical & Non Destructive Test)
of the test coupon.
One PQR can support one or multiple WPS(es).

Different types of variables in WPS
Essential variable:
 A change in welding condition which will affect the mechanical
properties other than toughness of weldment
 Any change in this variable calls for re-qualification of PQR
Supplementary – essential variable:
• A Change in welding condition which will affect impact toughness of
weldment
• Change in this variable calls for re-qualification of PQR in case there is
requirement of impact toughness for the vessel
Non - essential variable:
• No change in mechanical properties is expected
A WPS shall record all essential, supplementary essential &
non essential variables

Grouping of Base Material:
To reduce number of qualification, materials are grouped
into ‘P’ Numbers or Parent metal numbers and Group
numbers
List of most commonly used P Nos is given in next slide

P Numbers of Commonly Used Materials

F numbers:F numbers:
• Grouping of electrode on their usability characteristicsGrouping of electrode on their usability characteristics
• Determine the ability of welder to deposit sound weld.Determine the ability of welder to deposit sound weld.
• List of most commonly used F Numbers is given in nextList of most commonly used F Numbers is given in next
slideslide

F Numbers of Commonly Used Consumables

• Identification of weld metal chemical composition.
• To reduce the no of qualification
• List of most commonly used A-No is given in next
slide
A-No:

A Number

QW 402: Joints
• Non essential variables -
• Groove design,
• Backing,
• Root gap,
• Retainers

QW 403: Base metals
• Essential variables -
• P No,
• Thickness of base material qualified,
• Thickness of each pass beyond 13 mm for multipass welding
• Supplementary essential variables -
• Group no for base material
• Minimum thickness of base material qualified

QW 404: Filler Metals
• F no,
• A no,
• Thickness of deposited weld metal
• Flux / wire class,
• Alloy addition through flux (SAW),
• Re-crushed slag (SAW)
• Electrode Diameter > 6 mm for SMAW
• Non essential Variables –
• Change of Electrode Diameter for SAW

QW 405: Positions
• Change from any position to vertical uphill progression for SMAW.
• Non essential variables –
• Change in position.

QW 406: Preheat
• Decrease of more than 55ºC in the preheat temperature qualified.
• Increase of more than 55ºC in the interpass temperature qualified.
• Change of preheat maintenance i.e. Dehydrogenation Treatment
(DHT) etc.

QW 407: PWHT (Post Weld Heat
Treatment)
• Any change in the following conditions:
• No PWHT,
• PWHT below lower transformation temperature,
• PWHT above upper transformation temperature,
• PWHT between upper & lower transformation temperature.
• Supplementary essential variables –
• Increase in job PWHT soaking time beyond 20% of the
soaking time qualified in PQR.

QW 408 : Gas
• Single shielding gas to mixture of gasses,
• Different types of mixed gasses,
• Percentage composition of gasses for GMAW, FCAW, GTAW process
• Flow rate,
• Backing gas flow rate
• Backing gas composition

QW 409: Electrical Characteristics
• Increase in heat input ,
• Change in current type ( AC / DC),
• Change in Polarity (DCEN / DCEP)
• Change in current range,
• Change in range of voltage (except SMAW & GTAW)

QW 410: Technique
• Supplementary essential variables-
• Change in multiple to single pass per side .
• Change of Single to multi electrode for SAW
• Change of Stringer bead to Weave bead technique or vice versa,
• Method of cleaning,
• Method of back gouging,

Standard WPS Format (sheet 1 of 2)

Standard WPS Format (sheet 2 of 2)

Standard PQR Format (sheet 1 of 3)

Welder Performance Qualification
Purpose
• To validate the capability of an welder to deposit sound weld
metal following a qualified welding Procedure
• Establish the range of qualification to minimize the number of
qualification
• Guide line for renewal of qualification

Welder
• Person performing welding by manipulating arc by hand
Welding Operator
• Person performing welding by controlling the manipulation of arc
by machine

Requirement for Welder Qualification:
 A welder qualified by a company cannot be used by another
company
 When a welder changes a company fresh qualification is
mandatory

Essential variable:
 A change in welding condition which will affect the ability
of welder to deposit sound weld metal
 Any change in this variable calls for re-qualification

Essential variable for SMAW, GTAW as per Sec.
IX
QW 353, 356
 A change in welding condition which will affect the ability
of welder to deposit sound weld metal

Essential variable for SMAW, GTAW as per Sec. IX
QW 353, 356

Essential variable for Machine welding ( SAW), QW 361.2
 A change in welding condition which will affect the ability of
welder to deposit sound weld metal
 Essential Variables
 Change in welding Process
 Change from direct to remote visual control
 Deletion of Auto joint tracking
 Addition of welding position not qualified
 Deletion of consumable inserts
 Deletion of backing
 Single pass per side to multi pass per side

Welding Position for joints : QW 405.1, .3

Welding Position for joints : QW 461

Qualification Range
 Thickness of weld metal
 Position
 Pipe diameter
 Filler metal
 Base metal (for manual or semiautomatic processes)

Qualification Range- Thickness of weld metal

Qualification Range- Position

Qualification Range- Pipe diameter
OD of Test coupon,mm Minimum OD Qualified, mm
Less than 25 mm Size welded
25 to 73,mm 25 mm
73 mmOver 73 mm

Qualification Range- Filler metal

Qualification Range- Base metal , QW 425

Test for qualification Butt Joints
Mechanical test: Visual Examination and bend
test (QW302.1 &.4)
NDT: RT , 150mm length (QW304)

Test for qualification: Weld overlay
Mechanical test: Side bend
NDT: PT

QW322
Renewal of qualification: After every six month based on
production work, or welding a separate test coupon
Suspension of Qualification:
- If process is not used in last six month
- If there is specific reason for doubting the skill

Record of Qualification

List of reference:
ASME Section IX,Edition 2004

Asme sec. ix bkr - 051010

Recomendados

Recomendados

Mais conteúdo relacionado

Mais procurados

Mais procurados (20)

Semelhante a Asme sec. ix bkr - 051010

Semelhante a Asme sec. ix bkr - 051010 (20)

Mais de Jithu John

Mais de Jithu John (12)

Último

Último (20)

Asme sec. ix bkr - 051010