TO STUDY THE EFFECT OF WELDING ELECTRODES SIZE ON VARIOUS MECHANICAL PARAMETERS IN ELECTRIC ARC WELDING BY USING DIFFERENT CURRENT RANGE ON MILD STEEL
Author’s Name : Er. Surinder Kumar | Er. Deepak sharma| Er. Hardeep Kumar
Volume 07 Issue 01 Year 2020 ISSN No: 2349-3860 Page no: 1- 7
Welding is a skill that takes much practice to be a master, and selecting the correct electrode and current value for the job can be equally challenging. Electrodes are available in a wide range of sizes and types, each of which provide different mechanical properties and joint strength and operate with a specific type of welding power source. The selection of a correct type of welding electrode for specific application is a very important consideration in metal arc welding. Metal welding electrodes are used for various applications such as in the construction and repair of structures, bridges, agriculture, food and oil industries etc. The welding process is widely used in industry to join two metals with the help of fusion of two same metals or it can be different. In this research the effect on welded joint at different current range on its tensile strength, impact strength, hardness, Weld bed width, and Weld bed height properties of MILD STEEL was studied. To achieve the objective single-pass welds of Mild Steel plates having 10 mm and 12 mm thickness were fabricated by using different size of electrodes at two different current range (100 amps and 150 amps) by manual electric arc welding which is the most widely used welding methods because of its relatively high productivity, low maintains cost, easy operation and low running cost also. First the preparations of samples are done then they are welled under these various variables. Then cut in required dimensions for the tests like tensile, impact test, Weld bed width and Rockwell hardness. The tensile strength, Weld bed width and hardness properties of MS welded samples were evaluated under the required testing machines like universal testing machine for tensile test and charpy impact testing machine for impact strength and Rockwell hardness tester. It was found that the reduction in tensile strength (UTS) of the lap joint samples increases with increase in current range. Also, the best welding rod size is 6 mm, for tensile, impact strength and hardness but 3.5 mm rod where min Weld bed height is required for welding of mild steel. It is recommended that the observations of this work can be applied in the agriculture, food and oil industries where MS are predominantly used. It is also found that at the depth of penetration will increase with increasing in current and also found to be maximum tensile, impact strength and hardness is can be achieved by the use of 6 mm size with higher welding current.
arc weld, GMAW,AMPS,HAZ
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