ARC WELDING

INTRODUCTION:

Arc welding is a electrical welding, where it use current and electrode to weld the metal.

LEARNING OUTCOME:

1. To study how to setup AC machine.2. To study know the problem that occurs on the arc welding process.3. To study type of metal and electrode that are used in arc welding.4. To study know the angles that are used in arc welding process.

THEORY:

The basic principal of arc welding involves heating or melting of the base metal using electric arc. The electric arc is formed when there is a voltage difference between the metal coating at the end of the electrode and the surface of the metal. The Arc will produce enough to the melt the base metal and the end of the electrode to form a pool of molten metal. The electrode should be at 60° between two parts. So that, that equal heat and filler metal is directed onto both process.

EQUIENT AND APPARATUS:

1. AC machine 2. Glove3. Electrode holder4. Chipping hammer5. Apron6. Head shield.7. Wire brush.

PROCEDURE

BUTT JOIN:

1. Clean the surface of the metal plate with wire brush before welding. Place as close to the weld as possible to the metal plate.

2. Before striking an arc, insert an electrode to the electrode holder.3. Adjust the electric current according to the electrode size I use 110v.4. Weld the left side and right side for stable the metal.5. Weld along the base from left to right.6. Use the chipping hammer for clean the shell cause by weld.

STRAIGHT BEAD WELDING:

1. Clean the surface of the meta plate with wire brush before welding. 2. Before striking an arc, insert an electrode to the electro holder.3. Adjust the electric current according to the electrode size I use 110V.4. Draw the straight line under the metal.5. Weld along the base from left to right.6. Use the chipping hammer for clean the shell cause by weld.

RESULT:

BUTT JOIN

STRAIGHT BEAD WELDING

BUTT JOIN AND STRAIGHT BEAD WELDING

1. ARC STRIKE: A localized coalescence outside the weld zone. Precaution – in difficult area , adjacent area can be protected using

fire blankets.

2. MISALIGNMENT: Amount a join is out of alignment at the root. Precaution- workmanship , transition angle not to exceed 2.5 to 1

3. DISTORTION: Weld distortion is due to solidification shrinkage and thermal

contraction of the weld metal during welding. Precaution- welding short length on a planned or random distortion

are used to controlled this problem.

DISCUSSION:

1. What mean by MS in electrode?- MS is Malaysian standard.

2. What kind number of electrode is use for flat and horizontal?- It is 1 .

3. How much the voltage for standard arc welding?- 110v

4. What will happen if move slow in welding?- it will cause the size of alignment become large.

5. How many content in rod?- Steel- China clay- Rotile

6. Why the alignment become error?-It because of lack of experience and need more practical

7. How to prevent alignment become error?- Constant the slow movement and make a correct handle the electrode

holder with 60o from surface of metal.

CONCLUTION:

At the end of experiment

1. We know type of electrode and function for weld.2. We know how to control the electrode holder with 60o of hand level.3. We know how to weld with correctly4. We know how to setup the AC machine.5. We know what kind of alignment cause by weld with wrong method.

REFEERENCE:1. www.scribd.com 2. MR . DINO SABASTIAN