One, MIG welding
1, keep the 1/4&mdash wire rod; elongation of 3/8 inch (wire length extending from the torch head).
2, welding thin plate using small diameter welding wire, welding thick plate using large diameter welding wire and large current welding machine. See the specific performance of the welding machine recommended.
3, using the correct welding workpiece welding. Stainless steel wire welding stainless steel, aluminum welding wire welding of aluminum, steel wire connected steel.
4, using the correct protection of gas. Carbon dioxide is very suitable for welding of steel, but used to weld the sheet is likely to be too high temperature, the use of 75% argon and 25% carbon dioxide mixed gas welding of thin materials. Welding aluminum can only use argon. When welding steel, 3 kinds of gases can be combined into a mixture of gases (helium + argon + carbon dioxide).
5, to achieve the best control effect of welding, should be combined with edge wire directly at the molten pool.
6, when the welding operation is in a non normal position (when welding, horizontal welding, overhead welding), should maintain the pool is small to reach the optimal control of the weld, and as far as possible the use of straight two, the smallest diameter of wire.
7, to ensure that the use of wire sizes and sets of nozzle, liner, driving roller matching.
8, always clean up the gun liner and the driving roller, to keep the torch mouth without splash. If the gun mouth jam or wire is not smooth, it will change.
9, try to keep the welding torch straight, to avoid the wire problem.
10, welding operation using both hands to ensure the stability of the welding torch, and as far as possible to do so (the same applies to the electrode welding, TIG welding and plasma cutting).
11, the wire feeding machine and drive roller adjusting tightness in just enough wire, not too tight.
12, when the welding wire is not used, it will be kept in a clean and dry place, avoid pollution and affect the welding effect.
13, the use of DC reverse polarity DCEP power supply.
14, drag (pull) welding techniques can obtain a deep and narrow weld penetration. Gun technology can obtain a relatively shallow penetration and a wide weld.
Two, aluminum welding
1, is the most suitable for welding aluminum wire drawing welding torch, if you cannot use this gun, try to use the shortest in order to keep the torch torch straight; only use argon as a shielding gas; only use push technique in aluminum welding gun.
2, if found to have wire feeding problem, can try size than the size of a large number of conductive head.
3, the most commonly used welding aluminum wire is the standard of the standard welding wire. While the other is a hard (more easily wire feed), it is mainly used for the hardness and strength of the higher requirements of the welding operation.
4, before the welding start to do a good job in the removal of the surface layer of aluminum oxide, the use of a dedicated stainless steel brush to remove the oxide layer.
5, the end of the weld filled with a good arc pit to prevent cracks. One way is after welding torch in the molten pool will stay a few seconds.
Three, self protective flux cored wire welding
1, welding, using pull (or drag) gun techniques.
2, keep the welding wire clean and dry in order to achieve the best welding results.
3, the welding electrode welding, after welding the weld surface because the slag layer must be cleaned after completion of welding. Slag hammer and steel wire brush can be used for cleaning slag.
4, self protective flux cored wire welding does not need extra protection gas container. (protection agent in the wire). This feature makes it very suitable for use in outdoor work, because it is very easy to use in outdoor protective gas blowing.
5, self shielded flux cored wire welding in the welding of thin sheet than MIG welding difficult.
Four, TIG welding
1, very suitable for thin plate welding, clean welding process can get a beautiful appearance.
2, welding steel, aluminum using argon as a protective gas.
3, the use of direct current cathode (DCEN) welding of steel and stainless steel, the use of AC welding of aluminum.
4, in the TIG welding has been using gun techniques.
5, the tungsten electrode size and set size to match the current.
6, welding aluminum, should use the pure tungsten electrode. In this way, it is easy to form a spherical tip in the welding of the welding.
7, welded steel and stainless steel, should be used with 2% thorium tungsten electrode. The tungsten electrode should be sharpened in the DC cathode welding.
Five, welding rod arc welding
1, most of the time using the gun techniques.
2, do a good job in the preparation of welding slag splash.
3, keep the electrode clean and dry, — follow the manufacturer's recommendations.
4, penetration: negative direct current — maximum penetration, alternating current — medium penetration (also may be more splash), positive DC — minimum penetration.
Six, resistance welding
1, resistance welding is not suitable for welding aluminum, copper or copper alloy, and only used for welding steel and stainless steel.
2, to get more heat (current output), should use a shorter electrode arm.
3, if there is no heat control function of the welder, should use the length of the electrode arm to control. For example, when a thin sheet of low heat is needed for welding, a longer electrode arm is used.
4, attention should be paid to the longer electrode arm may bend, and may also lose pressure on the seam pressure.
5, to ensure that there is no gap between the welding workpiece, otherwise the welding effect will be greatly affected.
6, keep two electrode arms aligned so that the electrodes are aligned with each other. Keep adjusting the proper pressure, not too big or too small.
7, such as the need for a certain side of the workpiece after welding has a very good appearance, can be used to (with the machine) electrode that side.
8, often clean the electrode, otherwise the output (current) will be reduced, but also to the electrode with a suitable protective sleeve.