1、 How is the rounded corner of the square tube determined

需要先在方管上确定好圆角位置，并打上标记；接着用尺子计算好弯曲角度，并在方管上确定好;这时候需要根据方管宽度，计算出90度直角的弧形长度，将这个长度也画在方管上；用切割机沿画线切割出来，对折弯曲成90度后，用电焊机将重叠位置焊接好即可。

It is necessary to first determine the position of the rounded corner on the square tube and mark it; Next, use a ruler to calculate the bending angle and determine it on the square tube; At this point, it is necessary to calculate the arc length of a 90 degree right angle based on the width of the square tube, and draw this length on the square tube as well; Use a cutting machine to cut along the drawn line, bend it to 90 degrees, and then use an electric welding machine to weld the overlapping position.

二、市面上常见的方管有哪些类型

2、 What are the common types of square tubes on the market

1、按生产工艺分

1. Divided by production process

反观在建筑行业中是应用是非常广泛的，根据不同区域的使用特性，可以采用不同工艺生产出来的方管，譬如说有热轧工艺的无缝方管，冷拔工艺的无缝方管，挤压工艺制作的无缝方管，以及普通的焊接工艺方管等等。

On the contrary, it is widely used in the construction industry. According to the usage characteristics of different regions, different processes can be used to produce square pipes, such as seamless square pipes with hot rolling process, seamless square pipes with cold drawing process, seamless square pipes made with extrusion process, and the most common welding process square pipes.

2、按焊接方式为

2. According to the welding method

市面上焊接方管是普遍的，它有电焊、气焊两种工艺，其中电焊分为电弧焊方管、电阻焊方管，气焊的话，也有气焊、炉焊这两种工艺的方管，此外，还有焊缝工艺，即直缝焊、螺旋焊这两种。

It is the most common to weld square tubes on the market. There are two processes: electric welding and gas welding. Electric welding is divided into Arc welding square tubes and Electric resistance welding square tubes. For gas welding, there are also gas welding and furnace welding square tubes. In addition, there are welding processes, namely straight seam welding and spiral welding.

3、按断面形状分

3. Divided by section shape

有简单和复杂两种断面类型，其中简单的有方形和矩形两种方管，而复杂断面方管就比较多了，不仅有花形、开口形、波纹形的，还有各种异型的。

There are two types of cross sections: simple and complex, with simple square and rectangular square tubes. There are more complex cross section square tubes, including not only flower shaped, open shaped, and corrugated ones, but also various irregular ones.