鈍邊角度對直縫埋弧焊管的影響

Effect by Root Face Angle on Welding Quality of SAWL Pipe

摘要: 分析了直縫埋弧焊管合縫時的坡口形態(tài)，總結(jié)出鈍邊角度不合適是導(dǎo)致鈍邊合縫不嚴(yán)的根本原因；并給出鈍邊角度的計算公式，同時闡述了“噘嘴”對鈍邊合縫的影響，并就如何防止鈍邊合縫不嚴(yán)給出建議。分析認(rèn)為：通過選擇合適的鈍邊角度、適當(dāng)調(diào)整“噘嘴”值和坡口尺寸，可改善預(yù)焊合縫不嚴(yán)的情況，使內(nèi)焊產(chǎn)生氣孔、燒穿的缺陷比例降低至5%以下。

Abstract: The bevel shape of the SAWL pipe during joint-welding is analyzed. It is summarized that the improper root face angle is the root cause for the joint gap. Accordingly，the calculation formula for the root face angle is provided，while how the defective peaking influences the joint gap is discussed. Relevant suggestion is put forward for preventing occurrence of the joint gap. The analysis leads to such a conclusion that the joint gap as developed during pre-welding process is expected to be improved，and thus get the percentage of defects like porosity and burnthough， etc. as occurred during internal welding operation reduced to 5% or less by means of properly selecting root face angle，and appropriately adjusting the peaking value and the bevel dimensions as well.