不銹鋼風管焊接怎么做好打底？

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不銹鋼風管的焊接一般分為基礎(chǔ)焊、填焊和蓋焊。不銹鋼風管底焊是不銹鋼管焊接中關(guān)鍵的部分。它不僅關(guān)系到工程質(zhì)量，而且關(guān)系到工程進度。目前，不銹鋼風管打底分為充氬和非充氬兩種工藝。背面氬氣保護分為實芯焊絲+TIG工藝和實芯焊絲+TIG+水溶性紙工藝；背面非氬保護分為藥芯焊絲基焊和焊條（藥皮焊絲）基TIG焊。

The welding of stainless steel air duct is generally divided into foundation welding, filling welding and cover welding. The bottom welding of stainless steel air duct is the key part of stainless steel pipe welding. It is not only related to the project quality, but also related to the project progress. At present, the backing of stainless steel air duct is divided into argon filled and non argon filled processes. The back argon protection is divided into solid wire + TIG process and solid wire + TIG + water-soluble paper process; The back non argon protection is divided into flux cored wire based welding and electrode (flux covered wire) based TIG welding.

不銹鋼底焊的幾種方法不銹鋼底焊通常采用TIG工藝。根據(jù)現(xiàn)場實際情況，可采用以下四種方法進行底焊。① 背面采用封堵通風保護；②封堵通風保護僅采用可溶性紙或可溶性紙與封堵相結(jié)合；③藥芯焊絲Tig焊。④ 采用藥皮焊絲（自保護焊絲）進行TIG焊接

Several methods of stainless steel bottom welding stainless steel bottom welding usually adopts TIG process. According to the actual situation on site, the following four methods can be used for bottom welding. ① Sealing and ventilation protection shall be adopted at the back; ② Blocking ventilation protection only uses soluble paper or a combination of soluble paper and blocking; ③ Flux cored wire TIG welding. ④ TIG welding with flux coated welding wire (self shielded welding wire)

1背面用堵板阻擋通風保護方式（即實芯線+TIG）。不銹鋼管道預制時，焊接口通?？梢孕D(zhuǎn)，通風非常方便。側(cè)面密封通風，便于保護。底部焊接，外部用膠布密封。

1. Block the ventilation protection mode with blocking plate on the back (i.e. solid core wire + TIG). When the stainless steel pipe is prefabricated, the welded joint can usually rotate, which is very convenient for ventilation. Side seal ventilation for protection. The bottom is welded and the outside is sealed with adhesive tape.

焊接時，應采用早通風、延遲停氣的工藝。粘合布的外緣在焊接邊緣被撕掉。由于墊板由橡膠和馬口鐵組成，不易損壞，所以這種焊接方法可以保證焊縫內(nèi)側(cè)。充氬氣，保證純度，有效保證焊縫內(nèi)金屬不被氧化，保證焊縫底焊質(zhì)量。

During welding, the process of early ventilation and delayed gas stop shall be adopted. The outer edge of the adhesive cloth is torn off at the welding edge. Since the backing plate is composed of rubber and tinplate and is not easy to be damaged, this welding method can ensure the inner side of the weld. Fill argon to ensure purity, effectively ensure that the metal in the weld is not oxidized and ensure the quality of weld bottom welding.

2安裝和焊接不銹鋼管固定口時，只能使用可溶性紙或可溶性紙與堵板的組合（即實芯焊絲+TIG+水溶性紙）進行封堵和通風保護，內(nèi)部通風困難，有些側(cè)面更容易堵塞，此時采用水溶性紙+堵板可用于封堵。即易通風、易拆除的一側(cè)用堵板封堵，不易通風、不易拆除的一側(cè)用水溶性紙封堵，外側(cè)用膠布封縫。

2 when installing and welding the fixed port of stainless steel pipe, only soluble paper or the combination of soluble paper and blocking plate (i.e. solid core welding wire + TIG + water-soluble paper) can be used for blocking and ventilation protection. Internal ventilation is difficult, and some sides are easier to be blocked. At this time, water-soluble paper + blocking plate can be used for blocking. That is, the side easy to ventilate and remove shall be blocked with blocking plate, the side difficult to ventilate and remove shall be blocked with water-soluble paper, and the outside shall be sealed with adhesive tape.

焊接不銹鋼固定端口時，在許多情況下，焊縫兩側(cè)都沒有通風。如何確保焊縫內(nèi)部充滿氬氣保護成為一個問題。在現(xiàn)場實際施工中，我們采用水溶性的方法對焊縫兩側(cè)進行堵紙，從焊縫中 心排氣，并在外側(cè)粘貼一塊膠布，成功地解決了上述問題。

When welding stainless steel fixed ends, in many cases, there is no ventilation on both sides of the weld. How to ensure that the weld is filled with argon protection has become a problem. In the actual construction on site, we used the water-soluble method to block paper on both sides of the weld, exhaust from the weld center, and paste a piece of adhesive tape on the outside, which successfully solved the above problems.

用水溶性紙堵住通風時，由于通風是從焊縫中 心開始的，在密封環(huán)節(jié)應迅速拔出通風管道，并用里面剩余的氬氣保護，迅速完成底部，密封。

When blocking the ventilation with water-soluble paper, since the ventilation starts from the center of the weld, the ventilation pipe shall be quickly pulled out in the sealing link, and the bottom sealing shall be completed quickly with the remaining argon inside.

在這種方法中，需要注意的是，水溶性紙張應該是雙層的，并且須粘貼好。否則，水溶性紙易損壞脫落，造成內(nèi)焊縫失去氬氣保護，造成氧化，使焊縫重新開焊，既能保證焊接質(zhì)量，又嚴重影響工期。因此，焊接前應嚴格檢查焊接情況，并粘貼水溶性紙。

In this method, it should be noted that the water-soluble paper should be double-layer and pasted well. Otherwise, the water-soluble paper is easy to be damaged and fall off, resulting in the loss of argon protection for the inner weld, oxidation and reopening of the weld, which can not only ensure the welding quality, but also seriously affect the construction period. Therefore, the welding condition shall be strictly checked before welding, and water-soluble paper shall be pasted.

在很多施工現(xiàn)場，我們都用這種焊接方法做底漆，質(zhì)量能得到有效的保證，而且有一定的施工難度，所以我們應該選擇一個細心熟練的焊工來做這項工作。

In many construction sites, we use this welding method as primer, the quality can be effectively guaranteed, and there are certain construction difficulties, so we should choose a careful and skilled welder to do this work.

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