The common methods of processing and welding of ventilation pipeline in Shandong Province are manual welding, referred to as MMA, metal electrode gas shielded welding and tungsten inert gas welding, metal electrode gas shielded welding for short MIG / MAG, tungsten inert gas welding for short TIG.

Processing of ventilation pipe in Shandong Province

方法一：手工焊

Method 1: manual welding

使用非常普遍，且操作容易，主要是靠人進行調節，焊縫填充材料為電焊條。手工焊幾乎能焊接所有的材料，即使在室外也可以，因此它具有很好的適應性，一般焊接時是采用直流電。

It is widely used and easy to operate. It is mainly adjusted by human. The welding filler material is electrode. Manual welding can weld almost all materials, even outdoors, so it has a good adaptability. Generally, DC is used for welding.

電焊條，既可以是鈦型焊條，也可以是緘性的。鈦型焊條比較容易焊接，焊縫美觀，且焊渣容易去除。但缺點是如果長時間不用后再使用，那么必須重新進行烘烤，以防潮氣積聚。

The electrode can be either titanium electrode or sealed electrode. Titanium electrode is easy to weld, the weld is beautiful, and the welding slag is easy to remove. But the disadvantage is that if it is not used for a long time, it must be baked again to prevent moisture accumulation.

方法二：金屬極氣體保護焊

Method 2: gas metal arc welding

它屬于氣體保護焊，也是一種電弧焊，是在保護氣體下，焊條被電弧融化。金屬極氣體保護焊可用于鋼、非合金鋼、低合金鋼以及高合金等這些材料，使用很廣泛。但有一點，它的保護氣體必須為活性氣體，比如二氧化碳或者混合氣體等。的缺點是如果在室外進行焊接，那么工件不能受潮，否則會影響保護氣體的保護效果。

It belongs to gas shielded welding, is also a kind of arc welding, is in the shielding gas, the electrode is melted by the arc. Metal electrode gas shielded welding can be used in steel, non alloy steel, low alloy steel and high alloy and so on. But there is a point, its protective gas must be active gas, such as carbon dioxide or mixed gas. The disadvantage is that if the welding is carried out outdoors, the workpiece can not be affected by moisture, otherwise the protection effect of shielding gas will be affected.

方法三：鎢極惰性氣體保護焊

TIG welding method

電弧是在鎢電焊絲和工件之間產生，所以要求保護氣體為純氬氣，且焊絲是不帶電的，所以既可以手動送入，也可以機器送入，有時也可以不送入。然后它到底是使用直流電還是交流電，則取決于焊接材料。

The arc is generated between the tungsten welding wire and the workpiece, so pure argon is required as the shielding gas, and the welding wire is not charged. Therefore, it can be sent manually, mechanically or sometimes not. Then whether it uses DC or AC depends on the welding material.

鎢極惰性氣體保護焊主要是用于焊接薄和中等厚度的工件，材質的范圍很廣，包括合金鋼、鋁、鎂、銅、灰口鑄鐵、鎳、銀、鈦以及鉛等。

Tungsten inert gas welding (TIG) is mainly used to weld thin and medium thickness workpieces, with a wide range of materials, including alloy steel, aluminum, magnesium, copper, gray cast iron, nickel, silver, titanium and lead.