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方形鋼管焊接性是指金屬在特定結構和工藝條件下通過常用焊接方法獲得預期質量要求的焊接接頭的性能，焊接性一般根據焊接時產生的裂紋敏感性和焊縫區力學性能的變化來判斷。
Square steel tube welding metal refers to the performance expected quality requirements of welded joints commonly used welding method is adopted in the specific structure and process conditions, welding general changes according to the crack sensitivity of weld zone and mechanical properties of welding the judge.
方形鋼管焊接性能的好壞主要取決于它的化學組成。而其中影響最大的是碳元素，也就是說金屬含碳量的多少決定了它的可焊性。鋼中的其他合金元素大部分也不利于焊接，但其影響程度一般都比碳小得多。鋼中含碳量增加，淬硬傾向就增大，塑性則下降，容易產生焊接裂紋。
The quality of welded steel pipe is mainly determined by its chemical composition. The most influential factor is carbon, which means that the amount of carbon in the metal determines its weldability. Other alloying elements in steel are also not conducive to welding, but their effects are generally much smaller than carbon. With the increase of carbon content in steel, the hardening tendency increases, and the plasticity decreases.
通常，把方形鋼管材料在焊接時產生裂紋的敏感性及焊接接頭區力學性能的變化作為評價材料可焊性的主要指標。所以含碳量越高，可焊性越差。

In general, the sensitivity of the cracks in the welded steel pipe and the mechanical properties of welded joints are the main indexes to evaluate the weldability. So the higher the carbon content, the worse the solderability.
所以，常把方形鋼管中含碳量的多少作為判別鋼材焊接性的主要標志。含碳量小于0.25%的低碳鋼和低合金鋼，塑性和沖擊韌性優良，焊后的焊接接頭塑性和沖擊韌性也很好。焊接時不需要預熱和焊后熱處理，焊接過程普通簡便，因此具有良好的焊接性。隨著含碳量增加，大大增加焊接的裂紋傾向，所以，含碳量大于0.25%的方形鋼管不應用于制造鍋爐、壓力容器的承壓元件。
Therefore, the steel pipe in the square of the number of carbon steel as the main mark of welding. Low carbon steel and low alloy steel with carbon content less than 0.25% have good plasticity and impact toughness. It does not need preheating and heat treatment after welding. The welding process is simple and convenient. With the increase of carbon content, greatly increasing the tendency of welding cracks, therefore, the carbon content of more than 0.25% square steel pipe is not used in the manufacture of boilers, pressure vessels pressure components.
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