不锈钢风管焊接怎么做好打底？

发布人：http://www.sftfgd.com   发布时间：2022-01-06 17:02:35

不锈钢风管的焊接一般分为基础焊、填焊和盖焊。不锈钢风管底焊是不锈钢管焊接中关键的部分。它不仅关系到工程质量，而且关系到工程进度。目前，不锈钢风管打底分为充氩和非充氩两种工艺。背面氩气保护分为实芯焊丝+TIG工艺和实芯焊丝+TIG+水溶性纸工艺；背面非氩保护分为药芯焊丝基焊和焊条（药皮焊丝）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.

不锈钢底焊的几种方法不锈钢底焊通常采用TIG工艺。根据现场实际情况，可采用以下四种方法进行底焊。① 背面采用封堵通风保护；②封堵通风保护仅采用可溶性纸或可溶性纸与封堵相结合；③药芯焊丝Tig焊。④ 采用药皮焊丝（自保护焊丝）进行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背面用堵板阻挡通风保护方式（即实芯线+TIG）。不锈钢管道预制时，焊接口通常可以旋转，通风非常方便。侧面密封通风，便于保护。底部焊接，外部用胶布密封。

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.

焊接时，应采用早通风、延迟停气的工艺。粘合布的外缘在焊接边缘被撕掉。由于垫板由橡胶和马口铁组成，不易损坏，所以这种焊接方法可以保证焊缝内侧。充氩气，保证纯度，有效保证焊缝内金属不被氧化，保证焊缝底焊质量。

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安装和焊接不锈钢管固定口时，只能使用可溶性纸或可溶性纸与堵板的组合（即实芯焊丝+TIG+水溶性纸）进行封堵和通风保护，内部通风困难，有些侧面更容易堵塞，此时采用水溶性纸+堵板可用于封堵。即易通风、易拆除的一侧用堵板封堵，不易通风、不易拆除的一侧用水溶性纸封堵，外侧用胶布封缝。

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.

焊接不锈钢固定端口时，在许多情况下，焊缝两侧都没有通风。如何确保焊缝内部充满氩气保护成为一个问题。在现场实际施工中，我们采用水溶性的方法对焊缝两侧进行堵纸，从焊缝中 心排气，并在外侧粘贴一块胶布，成功地解决了上述问题。

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.

用水溶性纸堵住通风时，由于通风是从焊缝中 心开始的，在密封环节应迅速拔出通风管道，并用里面剩余的氩气保护，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.

在这种方法中，需要注意的是，水溶性纸张应该是双层的，并且须粘贴好。否则，水溶性纸易损坏脱落，造成内焊缝失去氩气保护，造成氧化，使焊缝重新开焊，既能保证焊接质量，又严重影响工期。因此，焊接前应严格检查焊接情况，并粘贴水溶性纸。

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.

在很多施工现场，我们都用这种焊接方法做底漆，质量能得到有效的保证，而且有一定的施工难度，所以我们应该选择一个细心熟练的焊工来做这项工作。

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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