Tools and work instructions
Service Manual
Repair welding
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Treatment of electrodes Use only dry electrodes for welding. Electrodes with damaged coating and rusted electrodes may not be used any longer. Electrodes must be stored in a dry room with a minimum temperature of 15°C. Open electrode packages must be carefully closed and stored after the welding work is complete.
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Welding technique The welding of material with the required electrodes (see chart under paragraph 7) is carried out according to DIN 1912. The adjustment of the welding current dictated by the different thicknesses of the electrodes can be taken from the chart of the electrode package. Beginning with material thickness of 8 mm, butt welds must be made in several layers. The weld is applied in several beads. Wide butt welds are filled with several side by side beads, with the last layer covering the center. The electrode should meld evenly without creating burrs and peaks. The valley or crater, which is created when changing electrodes must be filled in and overlapped with the next electrode. To prevent cracks in those craters, care must be taken that they are properly filled in. If the crack extends towards the outer edge of the material, slap may be trapped or burn holes may be created. To prevent this, the following aid may be used: tack apiece of sheet metal to the outer edge of the material. The welding seam begins now at the sheet metal in the direction of the arrow. After the welding is completed, the sheet metal is removed and the edge of the material is ground smooth. The welding seam must be cooled off slowly and should therefore be protected from rain and wind.
Fig. 4-1 Crack running to the outer edge of the material / Prepared crack
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