How to learn how to weld? What is the method of use?

Learning includes:

1, vertical or inclined position open beveled joints must be welded from the bottom up, not open beveled sheet butt and vertical angle welding can be used to weld down; flat, horizontal, elevated butt joints can be used to the left welding method. Outdoor work in the wind speed greater than 1m / s, should be used to prevent wind measures. Must be based on the structure of the workpiece being welded, choose a reasonable welding sequence.

2, docking ends should be set up with the appropriate size of the arc and arc quenching plate. Should often clean up the dirt in the hose and spatter from the nozzle. There is a beveled plate seam, especially the thick plate of the multi-channel weld, the wire swing on both sides of the bevel should be a little stay, serrated shipping bar each layer thickness is not more than 4mm, in order to make the weld fusion is good.

3, according to the diameter of the wire correctly select the wire conductive nozzle, the wire extends the length of the wire should generally be controlled within 10 times the diameter of the wire. Wire feed hose welding must be pulled smooth, not coiled, wire feed hose radius of not less than 150mm. welding should be sent to the gas hose before the residual impure gas discharge. The conductive nozzle after wear and tear of the aperture increases, causing welding can not be stabilized, need to re-replace the conductive nozzle.

Two welding welding preparation:

Welding joints before cleaning requirements on both sides of the bevel within 30mm affecting the quality of the weld burrs, oil, rust, dirt, oxide skin must be cleaned. When the construction environment temperature below freezing or the carbon equivalent of steel is greater than 0.41%, and structural rigidity is too large, the object is thicker should be used before welding preheating measures, preheating temperature of 80 ℃ ~ 100 ℃, preheating range of 5 times the thickness of the plate, but not less than 100mm.

Workpiece thickness is greater than 6mm, in order to ensure that weld penetration strength, in the buttressing edges of the plate should be used to open the cutting of the V-shape or X-shaped bevels Bevel angle of 60 ° blunt edge p for 0 ~ 1mm, assembly gap b for 0 ~ 1mm; when the difference in plate thickness ≥ 4mm, should be thicker plate butt edge beveling treatment.

Before welding should be CO2 welding machine wire feeding smooth situation and gas flow for careful inspection. If the use of bottled gas should be drained and purified, and should check the gas pressure, if less than 9.8 × 10.5PQ (10kgf/mm2) should stop using. According to different welding workpiece and welding position adjustment specification, the usual welding specification can be used in the following formula: V = 0.04I + 16 (allowable error ± 1.5V).