Butt | Spot | Projection | Seam | Special Purpose

SPOT WELDING-LOW CARBON STEEL Thickness 'T' Thinnest outside piece Electrode diameter and shape Electrode force Weld Time Welding Current Minimum contacting overlap Minimum weld spacing Dia. of fused zone Min. shear Strength Ultimate tensile strength of metal MM "D" mm (min) "d" mm (max) N Cycles (50/sec) Amps MM MM MM Tensile strength bellow 70000PSI Tensile strength 70000PSI & above 0.15 10 3 890 4 4000 10 6 3 580 800 0.20 10 5 1335 5 6500 11 10 3.5 1425 1960 0.25 10 5 1780 7 8000 11 13 4 2535 3560 0.30 13 6 2225 9 9500 13 19 5 4090 5335 0.35 13 6 2890 10 10500 14 22 5.5 6000 ----- 0.40 13 6 3560 12 12000 16 26 6 8225 ----- 0.45 16 8 4900 15 14000 18 32 7 12000 ----- 0.50 16 8 5780 17 15500 19 38 8 15350 ----- 0.60 16 10 7115 20 17500 21 42 8 18450 ----- 0.80 22 10 8000 22 19000 22 45 8.5 22240 -----   Note   TYPE OF STEEL-SAE-1010   MATERIAL SHOULD BE FREE FROM SCALE OXIDES, PAINT, GREASE AND OIL   WELDING CONDITIONS DETERMINE BY THICKNESS OF THINIST OUT SIDE PIECE "T"   DATA FOR TOTAL THICKNESS OF PILE UP NOT EXCEEDING "4t" MAXIMUM RATIO BETWEEN TWO THICKNESS 3 TO1   ELECTRODE MATERIAL CLASS 2   MINIMUM CONDICTIVITY 75% OF COPPER   MINIMUM HARDNESS 75 ROCKWELL "B"   MINIMUM WELD SPACING IS THAT SPACING FOR TWO PIECS FOR WHICH NO SPECIAL PRECAUTIONS NEED BE TAKEN   COMPENSATE FOR SHUNTED CURRENT EFFECT OF ADJACENT WELDS FOR THREE PIECES INCREASE SPACING 30% PERCENT   THE ABOVE DATAS ARE FOR GENERAL GUIDENCE ONLY

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