Mechanical Workshop Practice Report

MECHANICAL WORKSHOP PRACTICE REPORT MIG AND TIG REPORT

NAME

: MUHAMMAD ALTAF ANSARI BIN AZHAR

MATRIX NO : 01DKM13F1017 CLASS

: DKM3A

LECTURER :Mat Saberi Bin Mat Yusof : Siva Sangkaran Nair A/L Krishnan Nair : Wan Adzhar Bin Wan Ahmad : Khairul Azuan Bin Muhamad Yussop

INTRODUCTION ( MIG )

It is convenient, under this heading, those applications which involve shielding the arc with argon, carbon dioxide and mixture of argon with oxygen since the power source and equipment is same except for the gas supply. In MIG, larger welding current gives greater deposition rates. The process is suitable for welding aluminium, magnesium alloys, plain and low-alloy steels,stainless and heat resistant steel, copper and bronze, the variation being filler wire type of gas shielding the arc.

The consumable electrode of bare wire is carried on the spool and is fed manually operated or fully automatic gun through an outer flexible cable by motor driven rollers of adjustable speed and rate of burn-off the electrode wire must be balance by rate of wire speed.

METHOD OF WELD ( MIG )

Method of Initiating the Arc 1. The gun switch operates the gas and water solenoids and when released the wire drive is switched on together with the welding current. 2. The gun switch operates the gas and water solenoids and strikes the wire end of the plates operates the wire drive and welding current ( scratch start ) 3. The gun operates the gas and water solenoids and wire feed with welding current

T Joint 1. Switch on the welding ,achine and cooling machine. 2. 3. 4. 5. 6. 7. 8. 9.

Adjust the electric current so that it is suitable for the metal Connect the earth wire to the working table Student is advice to wear safety equipment to prevent danger Start the welding with Angle of the welding must be 45 degree Weld from right to left using speed of 0.4 to 0.6 m per minutes. Weld with the movement of ‘ zig-zag’ Make sure that both of the plate is connected.

INTRODUCTION ( TIG )

The welding of aluminium and magnesium alloys by oxy-acetylene and manual metal arc process is limited by the necessity to use corrosive flux. Tungsten inert gas welding enables these metal and a wide range of ferrous metal to be welded without the use of flux. The arc burns between a tungsten electrode and the work piece within a shield of the inert gas argon , which excludes the atmosphere and prevents contamination of electrode and molten metal. The hot tungsten arc ionizes argon atom within the shield to form a gas plasma consisting of almost equal numbers of free electrons and positive ions.

METHOD OF WELD ( TIG )

TIG Welding Technique 1. 2. 3. 4.

Cleaned and clamped or tacked together the base metal and the welding can be started. The arc is usually start when bringing the electrode near to the base metal. A high frequency spark jumps across the gap and start to flow the welding current. Steel, copper or alloys may be touched with the electrode without contamination to start the arc. 5. One starts, the arc is held stationery until a liquid pool appears. 6. Highest current values and minimum gas flow should be used to produce clean, sound welds of desired penetration.

REFERENCE

1. JJ204 Workshop Technology 2 book 2. www.wikipedia.com/metalinertgas 3. www.wikipedia.com/tumgsteninertgas