OPTIMALISASI PARAMATER RESISTANCE SPOT WELDING UNTUK PENGELASAN TIGA TUMPUK LEMBAR BAJA SPCC

Abstract

In the automotive industry, the latest breakthroughs and innovations are strongly influenced by
maintaining and increasing production results so that the use and application of technology is an
absolute must, as is welding technology. Thin sheet-shaped components are found in many car bodies.
One of the methods used in joining plate sheets is to use the resistance spot welding method, which is a
welding process that is only carried out at a certain point using copper electrodes. In the welding method,
maintaining quality in order to produce products and services that can meet the needs and expectations
of consumers related to the product's life time or service. SPCC steel (Cold Roller Stell Sheet) is one of
the most widely used materials in car body welding applications. The characteristics and mechanical
properties of SPCC steel from the results of the three-sheet welding were examined using the parameters
of welding current, welding time, welding distance. The results showed that the increase in current would
affect the diameter of the electrode traces and the nuggets that were formed. The greater the current used,
the larger the diameter of the trail, so that the optimum pull-shear load is at a current of 6.5 kA at a
distance of 20mm with a value of 365.53 MPa, also the highest hardness value is in the nugget area with
a hardness value of 595, 14 HVN at a current of 6.5 kA and from the results of measuring grain diameter
in microstructural testing for the HAZ area the best at a welding current of 6.5 kA. Because the smaller
the weld grain diameter, the greater the strength of the weld joint. Then the data from the results of the
shear-shear test are analyzed using the Taguchi method, and the most effective parameters in the tensileshear
test with a combination of A (6.5) B (1.5) C (15) and from the experimental results for tensile loads.
slide obtained 397 MPa.