Lesson Plan Smaw

Republic of the Philippines
DEPARTMENT OF EDUCATION
Region I
Schools Division Office I Pangasinan
Alvear St. Lingayen, Pangasinan
Tel. No./Fax No. (075) 522-2202(OSDS);(075) 632-8385(ASDS)
E-mail : pangasinan1@deped.gov.ph ; officeofthesdspangasinani@gmail.com
DATE:
LESSON PLAN IN SMAW TVL GRADE 11
I. Objectives:
At the end of the 60 minutes period at least 100 % of the learners were able to achieve
75% proficiency in the following:
1. Identify different kinds of welding joints

2. Perform different kinds of welding joints
3. Value the importance of knowing the different kinds of welding joints.
II. Subject Matter:

Topic : Types of Welding Joints in SMAW
……………(Butt joint /Tee joint /Corner joint / Lap joint /Edge joint )
a. ( TLE_IAAW9-12GW-Ia-j-1. )
b. Learning Competency : The learner performs different kinds of welding joints..

……………………………… (TLE_IAAW9-12GW-Ia-j-1)
c. Reference : Session Plan in SMAW Plates
d. Materials : projector, laptop, welding machine and accessories
e. Values : Keen Observation
III. Procedure:
A. Preliminary Activities
1. Prayer
2. Checking of attendance
3. Review past lesson
B. Developmental Activities
1. Motivation
Group Activity
Let’s learn together - Identify the kinds of Joints
2. Presentation of the lesson
Today, we are going to discuss about the Types of Welding Joints in SMAW
(TLE_IAAW9-12GW-Ia-j-1.)
3. Discussion
Types of Welding Joints
The term ‘weld joint design’ refers to the way pieces of metal are put together
or aligned with each other. Each joint’s design affects the quality and cost of the
completed weld. Selecting the most appropriate joint design for a welding job
requires special attention and skill. Different jobs need different types of welds.
Different types of welding joints are made to stand up to the needs and forces of
each individual application.
Butt Joint Welding
A butt joint is a joint where two pieces of metal are placed together in the same plane, and the
side of each metal is joined by welding. A butt weld is the most common type of joint that is
used in the fabrication of structures and piping systems. It’s fairly simple to prepare, and
there are many different variations that can be applied to achieve the desired result.
Butt welds are made in a variety of ways, and each one serves a different purpose. Varying
factors include the shape of the groove, layering and width of the gap.
Listed below are some typical examples of butt weld joints.
• Square
• Single bevel
• Double bevel
• Single J
• Double J
• Single V
• Double V
• Single U
• Double U grooves
The area of the metal’s surface that is melted during the welding process is called the faying
surface. The faying surface can be shaped before welding to increase the weld’s strength,
which is called edge preparation. The edge preparation may be the same on both members of
the butt joint, or each side can be shaped differently.
Tee Joint Welding
Tee welding joints are formed when two pieces intersect at a 90° angle. This
results in the edges coming together in the center of a plate or component in a ‘T’
shape. Tee joints are considered to be a type of fillet weld, and they can also be
formed when a tube or pipe is welded onto a base plate.
With this type of weld, it’s important to always ensure there is effective
penetration into the root of the weld.
There are a handful of welding styles that can be used to create a tee joint:
•Plug weld •J-groove weld

•Slot weld •Flare-bevel-groove weld
•Bevel-groove weld •Melt-through weld
•Fillet weld
Tee joints are not usually prepared with groove, unless the base metal is thick
and welding on both sides cannot withstand the load the joint must support.
Corner Joint Welding

Corner joints have similarities to tee welding joints. However, the difference is
the location of where the metal is positioned. In the tee joint, it’s placed in the middle,
whereas corner joints meet in the ‘corner’ in either an open or closed manner—
forming an ‘L’ shape.
These types of joints are among some of the most common in the sheet metal
industry, such as in the construction of frames, boxes and other applications.
Lap Joint Welding

Lap welding joints are essentially a modified version of the butt joint. They
are formed when two pieces of metal are placed in an overlapping pattern on top of
each other. They are most commonly used to joint two pieces with differing
thicknesses together. Welds can be made on one or both sides.
Image Credit: Science Direct

Lap joints are rarely used on thicker materials and are commonly used for
sheet metal.
Potential drawbacks to this type of welding joint include lamellar tearing or
corrosion due to
overlapping materials. However, as with anything, this can be prevented by
using correct technique and modifying variables as necessary.
Edge Joint Welding

In an edge joint, the metal surfaces are placed together so that the edges are
even. One or both plates may be formed by bending them at an angle.
The purpose of a weld joint is to join parts together so that the stresses are
distributed. The forces causing stresses in welded joints are tensile, compression,
bending, torsion and shear.
The ability of a welded joint to withstand these forces depends upon both the
joint design and the weld integrity. Some joints can withstand certain types of forces
better than others. The welding process to be used has a major effect on the selection
of the joint design. Each welding process has characteristics that affect its
performance. The rate of travel, penetration, deposition rate and heat input also affect
the welds used on some joint designs.
The following styles are applicable for edge joints:
• U-groove • Edge-flange
• V-groove • Square-groove
• J-groove • Bevel-groove
• Corner-flange
Due to overlapping parts, this type of joint is more prone to corrosion. Welders
must keep in mind other defects like slag inclusion, lack of fusion and porosity, which
can also occur.
I will demonstrate the best way to learn welding procedures in Butt joint.
What to observe:
1. Concavity 5. Porosities
2. Convexity 6. Undercut
3. Height of reinforcement 7. Cracks
4. Underfill 8.Cold laps
Welding Rubric
Criteria/ Not Needs Fair Good Excellent
Performance Performed Improvement
(1) (2) (3) (4) (5)
1. Gather all the materials
needed.
2.Wear complete PPE
3.Set up welding machine

4.Position weld properly
5.Position electrode
properly
6.Moving electrode with
constant rate of travel
7.Maintaining the width of
bead at about 2 ½ times of
the diameter of the
electrode
8.Continue welding until
reach the end of the line
9.Clean the weld using
chipping hammer
10.and steel brush or
grinding
11.Observe weld pass
12.Conductvisual inspection
13. Finished all the laid-
out lines
4. Application
The class will be divided into four groups. Each group will choose one
representative who will perform Welding Procedures in Types of Welding Joints
in SMAW .
5. Generalization
What is the importance of knowing the different welding joints?
What is the easiest type of joint to perform?
What is the difference between Corner joints and Tee joints?
IV. Evaluation:
Multiple Choice:
Read each question carefully and choose the best answer.
1.A common defect that occurs with tee joints is _________________.
A.Porosity B.Cracks C.Undercut D.Lamellar tears
2.A _______________ is a joint where two pieces of metal are placedtogether in the same
plane, and the side of each metal is joined by welding.
A.Lap joints B. Butt joints C.Tee joints D.Corner joints
3.This kind of joints are rarely used on thicker materials and arecommonly used for sheet
metal.
4._________ welding joints are formed when two pieces intersect at a 90°angle.
5.It refers to the way pieces of metal are put together or aligned with eachother.
A.Welding C.Weld put together
B.Joints D.Weld joint design
6. This kind of joints are rarely used on thicker materials and are ….. commonly used for
sheet metal.
A. Lap joints B. Butt joints C. Tee joints D. Corner joints
7. A _______________ is a joint where two pieces of metal are placed together in the same
plane, and the side of each metal is joined by welding.
8. It refers to the way pieces of metal are put together or aligned with each other.
A. Welding C. Weld put together
B. Joints D. Weld joint design
9. _________ welding joints are formed when two pieces intersect at a 90° angle.
10. A common defect that occurs with tee joints is _________________.
A. Porosity B. Cracks C. Undercut D. Lamellar tears
V. Assignment:
Answer the following questions using your idea base on the information given. In each
question your answer must be at least 50 words or more.
1. What are the necessary preparations before welding?

2. How many types of groove welds are there?
3. Why is it important to have a good cover pass?
Prepared by:
MR. JEFFREY T. JOVES

Teacher II
Noted:
MR. EUGENE D. MAMARIL, Ed. D.

School Principal I

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Republic of the Philippines

1. Identify different kinds of welding joints

II. Subject Matter:

b. Learning Competency : The learner performs different kinds of welding joints..

Butt Joint Welding

Listed below are some typical examples of butt weld joints.

•Plug weld •J-groove weld

Corner Joint Welding

Lap Joint Welding

Image Credit: Science Direct

Edge Joint Welding

The following styles are applicable for edge joints:

3.Set up welding machine

1. What are the necessary preparations before welding?

MR. JEFFREY T. JOVES

MR. EUGENE D. MAMARIL, Ed. D.

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