Performing Groove Welding on Carbon Steel Pipe NC 4

 Position the tack welds at 3, 6, 9, and 12 o'clock. (See Fig. 69)

Figure 69. Pipe as a clock face.
 Feather the tack welds with the grinder for complete fusion. (See Figure 70).

Figure 70.
 Position the pipe in the welding positioner as in Figure 71.

Figure 71. Pipe in the 2G position.

 Weld the Root Pass using a slight weaving "Drag" technique. See Figure 72 for the gun
angle.

Figure 72.
 Clean each deposited bead before making another run
 Root pass should be flush or not more than 3mm convex.
 Examine the root bead for complete penetration along the entire joint.
 Weld the Hot Pass using weaving "Push" technique. See Figure 72 for the Gun Angle.

NOTE: The Edge of the Groove should be retained. See Figure 73. This will be your guide in
depositing the Final Run or Cap Pass.

Figure 73.
 The cover pass should fuse with the base metal and with each other and can be flush or not

more than 3mm convex.
 Test the weld by passing one face bend and one root bend, if required.
 Check with the instructor for evaluation, if necessary
 Practice this exercise until you meet the standards established in the course.


Figure 74.
Figure 75.

Observation Checklist 2 Performance
Yes No
Criteria

1. Weld bead of the workpiece is free of defects in accordance
with specifications.

2. Weld size not greater than 2mm for side lap and 3mm for
crown height ±1mm.

3. Weld profile is in accordance with WPS/industry standards.
4. Penetration is minimum of flush to base metal and

convexity of not greater than 3mm in height in accordance
with WPS.
5. Work angle (mig gun/torch/rod) in accordance with ISO
standards.

PERFORMANCE TEST

Learner’s Name Date:
Test Attempt
Competency: Perform Groove Welding on Carbon Steel Pipes
1st 2nd 3rd

Directions: OVERALL EVALUATION PERFORMANCE LEVELS
Level
CALL INSTRUCTOR, ask instructor
to assess your performance in the Achieved
following critical task and
performance criteria below. 4 – Can perform this skill without supervision and with initiative
and adaptability to problem situations.
You will be rate based on the
overall evaluation on the right side. 3 – Can perform this skill satisfactorily without assistance or
supervision.

2 – Can perform this skill satisfactorily but requires some
assistance and/or supervision.

1 – Can perform parts of this skill satisfactorily, but requires
considerable assistance and/or supervision.

Instructor will initial level achieved.

PERFORMANCE STANDARDS Yes No N/A
For acceptable achievement, all items should receive a “Yes” or “N/A” response.

1. Performed fillet welding in the following positions:
- flat
- horizontal
- vertical
- overhead

2. Bead profile of weld is in accordance with WPS/ISO standard.

3. Ripple is regular in appearance.

4. Smoothness of joints and uniformity of finish bead are attained
according to specifications.

5. Work angle of the MIG gun/torch is maintained.
6. Leg size is attained according to specifications.

Learner’s diary

DIARY NOTES

Record important dates, jobs undertaken and other workplace events that will assist you in providing further
details to your Assessor.

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Record of Achievement

Module: Performing Fillet Welding on Carbon Steel Pipes

Learning Outcome #1 – Weld carbon steel pipes in flat position (1G).

Performance Criteria:

1. Bead profile is in accordance with WPS / ISO standard.
2. Ripple is regular in appearance and achieved in accordance with WPS.
3. Smoothness of joints and uniformity of finish bead are attained according to specification.
4. Work angle (MIG gun / torch) is maintained in accordance with ISO standard.
5. Leg size is attained according to specifications.

COMMENTS:
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Learner has satisfied the above performance criteria.

Learner’s signature: ……………………………………….

Trainer’s signature: ………………………………………..

Date: ……………………………………………………….

Record of Achievement

Module: Performing Fillet Welding on Carbon Steel Pipes

Learning Outcome #2 – Weld carbon steel pipes in horizontal position (2G).

Performance Criteria:

1. Bead profile is in accordance with WPS / ISO standard.
2. Ripple is regular in appearance and achieved in accordance with WPS.
3. Smoothness of joints and uniformity of finish bead are attained according to specification.
4. Work angle (MIG gun / torch) is maintained in accordance with ISO standard.
5. Leg size is attained according to specifications.

COMMENTS:
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Learner has satisfied the above performance criteria.

Learner’s signature: ……………………………………….

Trainer’s signature: ………………………………………..

Date: ……………………………………………………….

Record of Achievement

Module: Performing Fillet Welding on Carbon Steel Pipes

Learning Outcome #3 – Weld carbon steel pipes in vertical position (5G).

Performance Criteria:

1. Bead profile is in accordance with WPS / ISO standard.
2. Ripple is regular in appearance and achieved in accordance with WPS.
3. Smoothness of joints and uniformity of finish bead are attained according to specification.
4. Work angle (MIG gun / torch) is maintained in accordance with ISO standard.
5. Leg size is attained according to specifications.

COMMENTS:
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Learner has satisfied the above performance criteria.

Learner’s signature: ……………………………………….

Trainer’s signature: ………………………………………..

Date: ……………………………………………………….

Record of Achievement

Module: Performing Fillet Welding on Carbon Steel Pipes

Learning Outcome #4 – Weld carbon steel pipes in overhead position (6G).

Performance Criteria:

1. Bead profile is in accordance with WPS / ISO standard.
2. Ripple is regular in appearance and achieved in accordance with WPS.
3. Smoothness of joints and uniformity of finish bead are attained according to specification.
4. Work angle (MIG gun / torch) is maintained in accordance with ISO standard.
5. Leg size is attained according to specifications.

COMMENTS:
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Learner has satisfied the above performance criteria.

Learner’s signature: ……………………………………….

Trainer’s signature: ………………………………………..

Date: ……………………………………………………….