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攪拌車滾道在循環(huán)交變載荷的作用下，應(yīng)力較大區(qū)域可能形成初始微裂紋，然后發(fā)展成為宏觀裂紋，接著宏觀裂紋會(huì)繼續(xù)擴(kuò)展，導(dǎo)致焊道或母材開(kāi)裂。下面來(lái)分析自動(dòng)上料攪拌車滾道焊縫開(kāi)裂的原因。

Under the action of cyclic alternating load, the initial microcrack may be formed in the area with high stress in the mixer car raceway, and then it will develop into a macro crack, and then the macro crack will continue to expand, leading to cracking of the weld bead or base metal. Next, we will analyze the reasons for the weld cracking of the roller way of the automatic feeding mixer.

1，滾道焊縫處的應(yīng)力集中

1. Stress concentration at raceway weld

原因：滾道與筒體焊接時(shí)，焊縫處經(jīng)常出現(xiàn)應(yīng)力集中。此外，攪拌筒在使用過(guò)程中，滾道與托輪處的集中載荷以及滾道截面的整體變形也都會(huì)使焊接處出現(xiàn)應(yīng)力集中現(xiàn)象。

Cause: When the raceway is welded to the cylinder, stress concentration often occurs at the weld. In addition, during the use of the mixing drum, the concentrated load at the raceway and the supporting wheel and the overall deformation of the raceway section will also cause stress concentration at the welding point.

2，滾道焊縫處的殘余應(yīng)力

2. Residual stress at raceway weld

滾道與筒體剛度相差懸殊，一般情況下，攪拌筒筒體厚度為6mm的鋼板，滾道的徑向厚度在60mm左右，筒體和滾道厚度相差很大，在焊接過(guò)程中，滾道的熱膨脹受到限制，并且在冷卻過(guò)程中的收縮也受到限制，而筒體受限程度遠(yuǎn)小于滾道，影響到焊接應(yīng)力的大小及分布不均，導(dǎo)致殘余應(yīng)力的產(chǎn)生。

The rigidity of the raceway differs greatly from that of the cylinder. Generally, the radial thickness of the raceway of the steel plate with the thickness of 6mm of the mixing cylinder is about 60mm, and the thickness of the cylinder and raceway differs greatly. During welding, the thermal expansion of the raceway is limited, and the contraction during cooling is also limited. The cylinder is much less restricted than the raceway, which affects the size and uneven distribution of the welding stress, resulting in the generation of residual stress.

3，滾道與筒體的剛度變化

3. Stiffness change of raceway and barrel

滾道及筒體的剛度隨著車輛的使用呈遞減趨勢(shì)，大方量攪拌車尤為明顯，剛度的減弱會(huì)加速焊道的疲勞失效，導(dǎo)致焊道或母材開(kāi)裂。

The stiffness of the raceway and cylinder decreases with the use of the vehicle, especially for large volume agitators. The weakening of the stiffness will accelerate the fatigue failure of the weld bead, resulting in cracking of the weld bead or base metal.

當(dāng)攪拌筒與滾道出現(xiàn)焊縫開(kāi)裂時(shí)，根據(jù)焊縫開(kāi)裂程度的不同，可選擇相應(yīng)的修復(fù)方案。具體的詳細(xì)內(nèi)容就來(lái)我們網(wǎng)站http://www.fxsgujg.cn咨詢吧！

When the weld between the mixing drum and the raceway cracks, the corresponding repair scheme can be selected according to the different degree of weld cracking. Specific details will come to our website http://www.fxsgujg.cn Consult!