As a new type of flexible and simple activity room in modern society, the advantages and convenience of color steel activity room are very obvious. The main load-bearing frame of this kind of simple house is steel structure, and the wall is made of sandwich color steel plate. This kind of simple house has the advantages of fast and simple construction, convenient demolition, combined use and repeated use, which is very environmental protection.

鋼結構是彩鋼房的主要房體框架，所以鋼構的穩定性直接決定著活動房的穩定性，一旦鋼構發生變形則彩鋼房的結構也會變得很沒保障。為了避免鋼結構發生變形，人們常用下面四種方法：

The steel structure is the main frame of the color steel house, so the stability of the steel structure directly determines the stability of the movable room. Once the steel structure is deformed, the structure of the color steel room will become very insecure. In order to avoid the deformation of steel structure, the following four methods are commonly used:

1、夾具固定法：用剛性很大的夾具夾緊組合焊件，用強制力控制變形，然后進行焊連，這種方法稱夾具固定法。

1. Fixture fixation method: the rigid fixture is used to clamp the assembled weldment, and the deformation is controlled by the force, and then the welding is carried out. This method is called fixture fixation method.

焊連時焊件內部產生的膨脹力和收縮力，被夾具的作用力所局限，可明顯地減少變形。但此種方法焊件內部存在較大的內應力，對要求焊件內應力較小的構件，不宜采用此法。

The expansion force and contraction force generated in the weldment during welding are limited by the force of the fixture, which can obviously reduce the deformation. However, there is a large internal stress in the weldment by this method, which is not suitable for the components requiring less internal stress.

2、反變形法：構件在焊前，應根據被焊金屬構件情況判斷。在焊后置冷時，發生變形的方向和收縮量，將焊件預先向相反方向彎曲或斜置，焊后由于本身收縮變形，恰好恢復到預定的形狀位置。即可達到防止焊連變形與減少焊連應力的目的。

2. Anti deformation method: before welding, the component should be judged according to the condition of the metal component to be welded. When cooling after welding, the direction and shrinkage of deformation occur, and the weldment is bent or tilted in the opposite direction in advance. Due to its own shrinkage deformation, the weldment will return to the predetermined shape position. It can prevent welding deformation and reduce welding stress.

3、采用定位控制法：構件在焊前，用許多焊點將焊的部位或四周定位，還可在焊縫兩側壓以重物，這種方法稱定位控制法。

3. Positioning control method: before welding, many welding points are used to locate the welding position or around the component, and heavy objects can be pressed on both sides of the weld. This method is called positioning control method.

4、焊連順序法：正確安排焊連的順序，是防止變形的方法。焊連變形的規律是頭一道焊縫引起的變形較大，每道焊縫引起的變形量一般不能相互抵消，結果的變形方向總和先焊的焊縫引起的變形方向相一致。

4. Welding sequence method: the correct arrangement of welding sequence is the method to prevent deformation. The rule of welding deformation is that the deformation caused by the first welding seam is large, and the deformation amount caused by each welding seam can not offset each other. The deformation direction of the result is consistent with the deformation direction caused by the first welding seam.