| Standard Operating Procedure | SOP No. |
| --- | --- |
| Coupons | 7.024 |

Effective: 03-06-12

DCR No.: 11007

Supersedes: 05-04-07

Revision No.: 9

Revision Date: 03-06-12

Page No.: 1 of 3

## 1

## Purpose

1.1 To establish how often weld coupons are generated and when
submission to the Quality Control Examiner (QCE) for approval is
necessary.

## 2

## Scope

2.1 This procedure applies to both high-purity stainless steel piping, and tool
hookup assemblies.

## 3

## Responsibility

3.1 The Therma general foreman manages the welders and verifies
compliance with this procedure.

3.2 Qualified welders, certified under SOP 7.009 (GTAW Welder
Qualification) are responsible for performing and documenting the
following procedures.

## 4

## Procedures

4.1 Each coupon is labeled and recorded as per SOP 5.005 (GTAW Welds).

4.2 Weld coupons are used to establish a record of the welding parameters
that have been performed using a GTAW orbital welding machine.

4.3 Coupons are generated to establish valid welding parameters for the
orbital weld machines as per SOP 5.024 (Weld Program).

4.4 Coupons are made when the following conditions occur or change while
operating a GTAW orbital welding machine:

4.4.1 At the beginning of each shift.

4.4.2 When weld heads are changed.

4.4.3 When new purge gas source is used.

4.4.4 When power source is interrupted.

4.4.5 Change in tube diameter.

4.4.6 Welder discretion and/or wall thickness.

4.4.7 At the end of each shift.

4.4.8 On a Closure Weld.

4.4.8.1 When a weld cannot be examined via borescope due to
configuration limitations, an opening coupon shall be made
and examined by QCE to ensure that the weld head
characteristics are within welding acceptance criteria.
After the open coupon is made, welder shall proceed to
make a weld. After the weld is made, a closing coupon
shall be made and examined by QCE. Then, the closure
weld is done.

4.5 Notify QCE and submit coupons to QCE under the following conditions:

4.5.1 To establish valid welding parameters configuration program.

4.5.2 To establish a visual record for QCE’s reference. If project’s
scope of work requires to submit coupon to customer, QCE will
save the coupon(s) and submit it to customer after the project is
complete.

## 5

## Review and Approval

5.1 The Therma QCE shall examine the coupon as prescribed in SOP 7.005
(Automatic GTAW Weld Examination).

## Document Approval

Process Systems Manager

Date

Engineering Manager

Date

Quality Assurance Manager

3/6/12

Date