Weld joints: weld to weld junction known as the weld joints. Due to the limit the end of the electrode length, the joints of the weld before and after the two is inevitable, but the weld joints should strive for uniformity, and to prevent excessive weld joints, out of line width is inconsistent defects. Weld the joints of the following four categories:

1) middle connector: After welding the Welding Wire from the weld the rear of the first welding welding, require about 10mm before the crater near the arc, the arc length should be slightly longer than normal welding, and then back over the crater at suppress the arc and a short swing, and then forward the normal welding. This connection method is to use up to a suitable surface connector for single-layer welding and multi-pass welding.

2) contrary to the connector: The beginning of the two welds phase, requiring first the weld start slightly lower After welding the weld must be in the front end of the weld began slightly before at the arc, then slightly elongated arc arc gradually lead forward the beginning of the weld side, and cover the front end of the weld to be welded flat, and then the welding direction.

3) opposite the connector: This is the ending phase of the two welds, weld after welding to weld the weld when closing the arc at the welding speed a little bit slower, to be filled pit of the first weld to the faster speed and then slightly forward welding for some, and then extinction.

4) above retirement welding head: This is the beginning of the weld before welding and after welding the finishing phase, request weld close to the first weld the beginning, you should change the electrode angle, electrode point before the weld back-end, the elongated arc, upon the formation of molten pool, and then depress the arc, move back, and finally back to the original bath at Crater. Connector flat or not, and welders operating techniques, and also with the temperature level of the joints. Temperatures are high, then the more smooth. Therefore, the middle joints arc off time is shorter, faster action to change electrode. Multi-layer welding, the layer indirect head had to be staggered in order to improve the compactness of the weld.

In addition to the weld of the middle joints from time to clean up the welding slag, the remaining joints must first need to joints prior to welding slag removed, otherwise pick a bad weld joints, if necessary, the joints will need to hit ground bevel and then connector.

Welds Finish: The finishing of the weld is a weld after Crater. The end of welding, to do the finishing of the weld. Ending when they maintain the bath temperature in order to facilitate the weld joints. The ending in different ways, have repeatedly broken arc ending France, circled finishing method, the reflow finishing law and the transfer finishing law. Forming one-side welding, the weld finishing the main method of repeatedly breaking the arc ending France and back to the weld finishing. Repeatedly broken this small arc method generally used for acid electrode weld finishing, the reflow ending rule used for the alkaline electrode weld finishing touches, if the arc suddenly go off, the weld surface leaving sunken crater, reduce welding seam ending at the strength, and easily lead to the crater cracks. If finishing quickly pull off the arc, the gas in the liquid metal is too late to escape, but also prone to holes and other defects. In order to overcome the defects of the crater, and may use the following method ending:

1) repeatedly breaking the arc finishing method: repeatedly at the crater when the electrode to move to weld the end of extinction, the arc several times until it fills the crater. This method is suitable for sheet and high-current Welding Rod, the weld finishing, but is not suitable for the finishing of the alkaline electrode.

2) Circle the finishing method: when the electrode moved to weld the end of, at the crater circle movement, until it fills the crater and then pull off the arc, this method is suitable for thick plate finishing.

3) transfer of finishing method: when the electrode moved to weld the end of a brief stopover at the crater, the arc slowly raise, and then diverted to the weld edge of the base metal groove. At this time the bath will be gradually reduced, after solidification is generally not a defect. Replacement of electrodes or temporary stop of the ending of the arc.

German brand laser welding laser repair of precision mold processing technology to spread into China in the early 21st century, and

gradually replaced the traditional TIG welding and cold welding, but in Europe and the United States and other developed countries

such as Germany, the technology in 20 nineties has matured and developed into a rigorous level of the industrial system. The total

is well known, the welding of precision molds is different from other parts welding, quality control requirements are very strict, and

the repair cycle of the workpiece must be as short as possible. Traditional TIG welding heat affected zone around the welding

caused by collapsed, deformed probability is very high, for high precision welding area of ​​the mold must be heated warm-up

welding at a particular temperature, but also natural cooling annealing, so toss down the cost and time are not accepted by the

users; cold welding and welding is not solid and shedding defects. Laser welding TIG welding and cold welding of these

deficiencies, gradually being widely used.
Industrial development imbalance also exists in Germany, the most advanced industries are concentrated in West Germany and

East Germany the technology from the former Soviet Union, several industrially developed cities mainly refers to Munich, Frankfurt

and Stuttgart. Similarly, a pioneer of the laser welding industry in West Germany. In China, the most commonly used laser welding is

a dedicated the GHJ laser wire commonly used models in Germany: 8407, SKD11., SKD61, S136.P20718.738, manufacturers in

the world-famous industrial cities - Stuttgart. Back in the early 1990s, has been in the argon arc Mig Welding Electrodestechnology the GHJ

manufacturers have realized the huge market for laser repair mold, purchased a number of laser welding of Germany's external

repair precision molds, as Germany's first professional to provide precision mold laser repair technology, production and service

providers, and through trial and improvement, combined with the technology of metallurgy and cold drawing to produce a the GHJ

brand laser welding. The the GHJ manufacturers have been using their own production of wire repair mold, Mercedes-Benz and

BMW auto mold factory is a the GHJ factory fixed customers. In China, just two years the GHJ wire market share has reached more

than 60%.
Germany, there are other brands of wire, but because of the lack of the Welding practical experience, its quality has been plagued by

the question, for welding similar mold polishing sticks and special heat treatment, there is always quality problems; part of the wire

manufacturer located in East Germany, inherited production technology in Russia and wire prices are relatively cheap, but the quality

of the welding process is always so end-users bruised and battered. China's domestic use of wire varied, 90, # 90, M90 and so on.

Part of dealers to profit as a stainless steel wire, welding pull fine wire laser Welding Wireto sell, even posing as a German the GHJ

brand wire to sales. Not regulate competition in the domestic market, leading brand wire has not been fully utilized, thus not improve

the quality of domestic wire and laser welding mode for a long time. It also laser repair mold technology lagged behind the

advanced countries more than a decade, one of the reasons.
German brand laser welding method to identify a lot, mainly in the following ways: 1, welding grinding, no trachoma, crack, black and

poor weld quality, weld hardness of base metal; good quality wire surface metallic luster, good toughness, absorb moisture easily

rust, will not rust the wire coated with anti-rust layer thickness, or its material close to the stainless steel components after welding

is easy to produce trachoma or easily deformed off or hardness is very low. The laser can melt, burn, or vaporize almost all of the

material. If you are using wire containing heavy metals, or wire plated anti-rust layer containing toxic ingredients, these gases and

steam will endanger human health. We recommend that the laser welding of the majority of users to be vigilant, not to use laser

welding consumables in order to ensure the health of the laser welding operators, as well as improve the technical quality of the

laser welding mode. .