In order to determine whether it is necessary to place surfacing layers at both sides of the steel plate groove in advance in the test on metal deposited with cellulose electrode

different number of surfacing layers are placed on the square test plate

and it is observed that the chemical composition of the welding line is close in each case. The chemical composition of itself has increased in different proportions

indicating that the chemical elements of the base metal are diluted into the weld

but it will not change significantly with the increase of the number of layers. By analyzing the chemical test piece at different distance to the groove welding line

it is found that the conclusion is similar to that for the base metal

that is

the chemical composition of the base metal has been diluted into the welding line to different extent

with no apparent difference in chemical composition at different vertical distance to the groove observed; the mechanical properties of materials with no surfacing layer are similar to that of those with one surfacing layer

while the mechanical properties of materials with two surfacing layers slightly outperforming that of those with no surfacing layer or only one surfacing layer.