1, adhere 1/4-3/8 inch wire rod elongation (length of wire protruding from the welding torch head).
2, the use of small diameter wire welding sheet metal; welding thick plate using large diameter wire and large current welder. Check welder referral introductions.
3, use the correct wire welding workpiece. Stainless steel wire, welded stainless steel, aluminum aluminum welding wire, steel wire steel.
4, the use of the proper maintenance of gas. The carbon dioxide is very suitable for welding steel, but for welding sheet can be high temperature, should be the use of a mixed gas of 75% argon and 25% carbon dioxide welding thinner. The welded aluminum you can only use argon gas. Welded steel, you can also use a combination of three kinds of gases into a mixed gas (helium + argon + carbon dioxide).
5, reaches manipulating weld bead should adhere to the wire connected directly aligned with the weld pool marginal.
6, when the time division (vertical welding, horizontal welding, overhead welding) welding operation in a non-normal orientation, should insist on a small molten pool to reach the best handling of the weld bead, and the use of the smallest diameter of the wire as possible.
7, ensure that you use wire scale sets of mouth, liners, drive rollers match. Imported pumps
8, often finishing gun liner and drive rollers to adhere to the welding torch mouth no splash. If the welding torch obstruction perhaps wire feed ring true, it will replace it.
Welding, try to stick to the welding torch vertical to prevent the wire feed problems.
10 hands also use theMig Welding Electrodeoperation in order to ensure the stable welding torch, and do to be able to do so. (This same applies to the stick welding, TIG welding and plasma cut).
11 spools of wire feeder and drive wheel tightness conditioning just meet wire feed, do not overtighten.
12, when not in the wire, save it in a clean and dry, address, prevent being contaminated and affect the
1, using the copper and iron electrode (e.g., Z607) during welding, the electrode metal in the iron and copper immiscible, the state of existence to the mechanical mixture, and mixing was uneven. When the electrode in w (Fe), when a 30% increase in the greatly reduced, so that the ductility of the weld metal in the weld of the welding rigid couplings, easy to produce cracks in the weld. Should take short-arc welding, to reduce welding rod swing multilayer welding process measures to prevent welding cracks.
Cast iron cold welding to repair individual casting defects, often using pureNickel Electrodesor nickel-iron, nickel-copper electrode repair welding, Z308, Z408 and Z508. Nickel-copper electrode welding and iron castings, machining performance is better, but the tensile strength of the weld metal is generally low, due to the shrinkage of copper-nickel alloy weld crack resistance than poor. Therefore, this electrode is only applicable in strength is less demanding, but the surface of the casting repair welding processing. Patching the advantages of pure nickel electrodes are the good processability of the weld metal, but expensive, and should not be used in normal circumstances. Still need to pay attention to use this type of electrode operation, in addition to the requirements of the general process welding, repair welding speed not too fast, should be intermittent welding. Each weld length should not exceed 40-50mm, and struck with the Hammers after the solder layer to eliminate stress. After the weld cold not hot welding the second layer, so as to ensure the repair welding work to achieve better results.
3, high-vanadium cast iron electrode is a more economical cast iron cold welding Mig Welding Electrode, such as the Z116 and Z117. This electrode need to use short arc welding, welding and in segmented regressive order, each piece approximately 10-30mm, should adopt a small current, after welding, the same percussion welds, to reduce stress.